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Derek James Byrne

Probate Attorney at Saint Petersburg, FL

4.9   17 reviews
  • Licensed for 12 years
    State FL
    Acquired 2011
    Member in Good Standing No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Derek

Learn Derek’s areas of practice.

Our firm is dedicated to providing quality legal services in the Tampa Bay area. Both partners are highly experienced in civil litigation, although Andrew Mallory is also a skilled criminal defense attorney while Derek Byrne handles most of our Family Law litigation. Our diverse backgrounds allow us to handle an array of legal issues and in our opinion, makes us better attorneys. Both partners are involved in the community. In fact, Mr. Byrne was recently appointed as Chairman of the Family Law Section of the Saint Petersburg Bar. 


Derek J. Byrne, Esq.
540 4th St. N.
Saint Petersburg, FL, 33701

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4.9 / 5.0
  17 customer reviews
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Posted by Matt | January 11, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Best Family Law and divorce attorney
We hired Derek for our family trust and he was great. Ended up having to use him to help with consulting with a friend for divorce, even better. Didnt drag things out. Was fair and on his side. I highly recoommend him and his practice. The whole process was easy regarding the family trust, and it was complicated with all the businesses, but he made it easy for us.
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Posted by anonymous | September 10, 2020
This review is from a person who hired this attorney.
| Hired Attorney
I can’t recommend Mr. Byrd and his firm highly enough.
This review of Mr. Derek Byrd was composed from the overall context I experienced in working with him as he guided and supported me during a very difficult divorce. Focusing solely on his superior skills, abilities and wisdom of his craft would significantly diminish all that he offers when you hire him. To be candid, I’d never had a positive experience with an attorney until I worked with Mr. Byrd. From the outset, he was able to simplify the complex which is truly a gift. His perseverance, communication, attention to detail, among many other remarkable qualities, is unsurpassed. He consistently demonstrated his uncompromising ethics and an ability to empathize.
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Posted by Mary | June 26, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Highly Recommend
I had a wonderful experience with Derek as my attorney and I cannot recommend him enough! He and his team were always prompt and positive, without sugarcoating things. I was going through a tough divorce and Derek and Tanji were there with me every step of the way. I was able to trust them which was huge. Derek is very knowledgeable and experienced; he gave me great advice and always had my best interests in mind. Derek and his team were thorough and took their time to quell my fears and answer any and all questions I had. I cannot recommend Derek enough!
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Posted by Donna | January 15, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Thankful for Derek!
During the heartbreak of a divorce Derek handled my daughter’s divorce with first and foremost care and genuine concern. Derek was always quick to respond to an email or phone call. He would answer any question we had regarding the next step and kept us informed. He made the process flow and allowed my daughter to concentrate on her own well being rather than the legal process. I and my daughter are grateful for his services and how he handled the process in a professional & timely manner. Sincerely grateful!
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Posted by Kelsey | January 14, 2019
This review is from a person who hired this attorney.
| Hired Attorney
The Best Family Law Attorney
Without hesitation, I would undoubtedly say that Derek Byrne is the best family law attorney in the area. We have dealt with quite a few that have not only been overworked, but complacent in their cases- there's no drive to move your case along; a lack of attention to detail, and ridiculous amount of hours billed. Derek isn't any of that. Derek is an intelligent and highly competent attorney. He understands the law, how it is applied, and how the Judges think. He won't tell you what you want to hear- he will tell you what you need to hear so together you both can collaborate to create the best possible outcome for your case. He's responsive (literally calls back within a few hours), makes time for your case, and moves it along so you can get resolution and the best possible outcome. I have referred him multiple times, and he will continue to be our attorney for any issues that arise. I cannot recommend him enough. Thank you Derek for all the work you've done on our case, and for our family.
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Posted by Kristyn | January 10, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Professional & Agressive
Derek is a very professional and aggressive divorce attorney. My husband hired him for his divorce and child custody case against his ex wife and not only was Derek able to defend my husband and I but he was able to satisfy our wants and needs for the benefit of our family. His attention to detail and his calm & empathic demeanor made the lengthy process as stress free as possible. My husband and I are forever grateful for all his hard work and would unquestionably recommend him to anyone.
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Posted by Rebecca | May 12, 2017
This review is from a person who hired this attorney.
| Hired Attorney
I'm very lucky to have found Derek Byrne. Anyone familiar with a broken home has heard endless tales of battles within the court system. Derek manages my time and money extremely well. He is accurate in his expectations, patient with my inquiries, and above all, puts my child's needs before everything.
Posted by Jon | February 20, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Friendly and Professional
Derek helped my family and I through a tough time recently. He was able to get things settled with the aposing council in a timely manner and let us get started on our new journey.
Posted by Abbey | December 31, 2015
This review is from a person who hired this attorney.
| Hired Attorney
Derek Byrne - Divorce Attorney
So glad I chose Derek Byrne as my lawyer. During the divorce process, Attorney Byrne was very kind and clearly communicated the necessary steps. I felt he was truly there for me, the person, because that is who he is, and I would highly recommend him to anyone looking for an ethical lawyer. Thank you so much Derek!
Posted by Jackie | December 21, 2015
This review is from a person who hired this attorney.
| Hired Attorney
By far the BEST family law attorney!
My husband has hired attorneys in the past in which communication was minimal and end results were ridiculous. A friend referred us to Derek Byrne for custody modification of his son and it was the best thing to happen to our family as he now has full custody of him after over a decade of the child having to go back and forth daily. Mr. Byrne not only managed to get it done; he managed to do so in record time! He is extremely knowledgeable of the law and has an amazing talent of communicating every step of the way making us feel like we were a priority. We thank God for blessing us with someone we can trust to take care of our family like Derek.
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Posted by Chris | October 30, 2014
Highly recommended! and trusted!
Derek helped me get my family law case handled in a professional matter. He is very trustworthy and I highly recommend him if you need professional, knowledgeable help. Thanks Derek!
Posted by Jerome | September 4, 2014
Excellent Service
It is a pleasure to take the time and write a review for Mr. Byrne. He not only was well versed in my matter, he guided me through my options and explained in detail what they were. But most importantly what was in the best interest for me, not himself and/or his firm. Mr. Bryne kept me informed throughout the process and did so at a very reasonable rate, and with absolutely no "add-ons" His service was outstanding, and again at cost that was more than fair
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Posted by Jeff | August 22, 2013
Thanks Derek!
Derek was very helpful giving great advice that I needed. He was very knowledgable and presented everything in a way I could easily understand. Many thanks to Derek for a favorable outcome.
Posted by Todd | July 30, 2013
Derek did a great job on my case!
Derek handled my case with care, respect and professionalism. He is knowledgeable and always had a grasp on where my case was. I could tell he worked very hard to give me the best outcome possible. And I was very happy with my outcome. Thank you Derek. Your hard work and professionalism did not go unnoticed. You will be highly recommended by me to anyone in need of your services.
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Posted by grateful | March 23, 2013
Top notch
So far so good! Mr. Mcleod and Derek and all of their staff have been so helpful to me during this process. I am going through a lot dealing with collusion and a man trying to take majority of time share from me due to his control and unwillingness to pay the child support he is supposed to pay. This case has been going on for over 3 years because I had mistakenly hired the wrong representation. It has been the hardest thing in my life watching my daughter/daughters go through what they have been all because of their anger and control issues. Derek is not only very smart he is compassionate and keeps you informed every step of the way. I feel that he has my back and truely cares about the outcome of this case.
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Posted by anonymous | February 14, 2013
Very professional.
Derek provided me with the best representation during a very difficult time in my life. He fought for me with wisdom and in a timely manner. I always felt he was truly working for my best interest.
Posted by Rich | January 31, 2014
Derek handled my case professionally and above board. I was kept informed and given good counsel. His relationship with Phil was also beneficial. I would recommend him and use him again.
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  • Hourly Rates $ 300-300 per hour
Payment methods
Cash, Check, Credit Card


AVVO RATING 10.0 (Superb)

Work Experience

  • Partner
  • Byrne Mallory, PLLC
  • 2018 - Present
  • Partner
  • Derek J. Byrne, Esq.
  • 2015 - 2018
  • Division Leader
  • Philip A. McLeod, P.A.
  • 2012 - 2015
  • Senior Associate
  • Hightower, Stratton, Wilhelm
  • 2011 - 2012
View all work experience


  • Stetson University College of Law
  • JD - Juris Doctor
  • 2010
  • University of South Florida
  • BA - Bachelor of Arts
  • 2007


  • Florida Bar
  • Family Law Section Memnber
  • 2019 - Present
  • St. Petersburg Bar Association
  • Chairman of the Family Law Section
  • 2018 - Present
  • Committee to Re-elect Judge Thomas Minkoff
  • Member
  • 2018 - Present
  • Canakaris American Inn of Court
  • Associate
  • 2013 - Present
  • Florida Bar, Trial Lawyers Section
  • N/A
View all associations

Languages Spoken

  • English

Honors and Awards

  • Top 40 Under 40
  • The National Advocates
  • 2019
  • Top 40 Under 40
  • The National Advocates
  • 2018

Speaking Engagements

  • The New Family Law Client
  • Pleading requirements in Florida Family Law cases
  • 2018
  • 2018 Florida Constitutional Amendments Forum
  • Florida Constitutional Amendment Debate
  • 2018

Attorney endorsements

Received (19)
Given (20)
Endorse Derek
Family Attorney | Jan 03
Relationship: Fellow lawyer in community
"Derek is knowledgeable and up-to-date regarding the current laws and practices in family law. I am grateful that Derek allows time in his schedule to share his knowledge by instructing his fellow attorneys through continuing legal education presentations."
Family Attorney | Mar 13
Relationship: Opposing Counsel on matter
"Through the last several years, I have worked with Derek Byrne on several different family law cases as opposing counsel. You cannot find a more hard-working, stronger, ethical and knowledgeable advocate. I strongly endorse this lawyer."
Unknown Attorney | Feb 22
Relationship: Fellow lawyer in community
"An excellent lawyer who treats his clients with patience, care, understanding, and utmost professionalism. He is an even better person and I wholeheartedly recommend him for future services."
Unknown Attorney | Jan 09
Relationship: Fellow lawyer in community
"I went to law school with Derek. I have recommended many case to him as a family law attorney. I endorse this lawyer."
Family Attorney | Jun 26
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Family Attorney | Dec 18
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Divorce and separation Attorney | Dec 05
Relationship: Fellow lawyer in community
"Derek knows how to get results. He is a strong attorney, hard-working and very sharp. On top of his legal skills, Derek's ability to communicate separates him from the pack. I highly recommend him."
Unknown Attorney | Nov 24
Relationship: Opposing Counsel on matter
"I have had the honor of litigating against Mr. Byrne and I can tell you from experience that he is a fierce litigator who fights tooth and nail for his clients"
Family Attorney | Apr 21
Relationship: Friend
"You will be hard pressed to find a more tenacious attorney than Derek. I recommend Derek for any family law matter requiring an aggressive attorney."
Family Attorney | Sep 24
Relationship: Fellow lawyer in community
"Derek is professional, hard working and a pleasure to associate with. We went to law school together and he was always willing to help. I feel proud to be working in the same field and same community as Derek."
Family Attorney | Jun 02
Relationship: Fellow lawyer in community
"I endorse Derek. He is a highly skilled attorney that is well respected in the legal community."
Family Attorney | Apr 21
Relationship: Fellow lawyer in community
"I endorse this lawyer. Derek does a great job for his client and always goes the extra mile."
Family Attorney | Sep 12
Relationship: Fellow lawyer in community
"Derek Byrne is a great attorney. I have worked alongside him many times and am always impressed with his work ethic and legal knowledge."
Family Attorney | Jul 26
Relationship: Fellow lawyer in community
"I endorse attorney Derek Byrne. I would highly recommend him to anyone looking for a personal injury and/or family lawyer."
Family Attorney | May 01
Relationship: Fellow lawyer in community
"I endorse this lawyer, without hesitation. I knew him throughout our time in law school together and witnessed his work ethic from both an academic setting and then later a professional real-world environment as well. If you are in need of a family law or personal injury attorney, this is who you should seek out."
Family Attorney | Apr 15
Relationship: Fellow lawyer in community
"I endorse this lawyer. I have know this lawyer for many years and throughout his law school tenure. It is clear that Mr. Byrne has hit the floor running and on his way to being an excellent advocate."
Family Attorney | Mar 14
Relationship: Fellow lawyer in community
"I endorse this lawyer. Mr. Byrne is very knowledgeable of the law; and is a zealous advocate for his clients. I highly recommend Mr. Byrne to assist you with your family law and other legal needs."
Family Attorney | Feb 14
Relationship: Fellow lawyer in community
"After just a few minutes of speaking with Derek you will learn for yourself what I am about to tell you: he is smart. very smart. I highly recommend this attorney if you are facing any sort of a legal fight."
Insurance Attorney | Apr 21
Relationship: Fellow lawyer in community
"Mr. Byrne is an excellent advocate who is experienced in the courtroom. I highly recommend this lawyer's services."
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