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After watching a jury trial at the age of thirteen, Mark Osborne knew he wanted to be a lawyer. After graduating from college, he attended New England School of Law in Boston, MA from which he graduated in 2003.
Even while in law school, Mark Osborne represented underprivileged families and senior citizens in the Boston Housing Court, where he worked tirelessly to keep them from being evicted from their homes. After graduating from law school, Mark decided that rather than joining a large Boston law firm, he wanted to continue to help people. He continued to walk down the career path of public service by accepting a prosecutor's position with the Rockingham County Attorney's Office.
During his tenure at the Rockingham County Attorney's Office, he prosecuted countless DWI's and misdemeanor cases in the Portsmouth and Auburn District Courts. He also began trying felony cases before juries in the Rockingham Superior Court.
Eventually, Mark decided that the time had come for him to seek a more challenging case load. Thus, he became a prosecutor at the Hillsborough County Attorney's Office in Nashua, NH. While at the Hillsborough office, Mark had numerous jury trials where he prosecuted major felony cases including rapes, child molestations, armed robberies, violent stabbings and beatings, shootings, drug sales, thefts, and serious DWI cases.
As a prosecutor for some of Nashua's most serious felony cases, Mark came to appreciate the reality that there are always two sides to every story or allegation - regardless of what is written in a police report. Mark came to understand that there is no substitute for doing your own work and investigating in order to get to the bottom of a case. Towards the summer of 2007, Mark decided that he had tired of the monotony that sometimes comes with being a prosecutor. He had grown bored and frustrated with simply going to work and pointing the finger at people who had made mistakes in life. He decided that the best way to help people in a manner of which he could be most proud, was to become a defense attorney.
In 2007 Mark decided to open his own private law firm on Main Street in downtown Nashua, NH. Since then Mark has been trying major felony, misdemeanor, and DUI cases in front of judges and juries alike throughout New Hampshire. In and out of court, Mark has been strategically battling for his clients and seeking fairness, justice, vindication, compassion, and common sense solutions on their behalf.
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Chat withState: New Hampshire
Acquired: 2003
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351 Main St.2nd Floor, Nashua, NH, 03060
Showing 1 - 5 of 8 client reviews from Avvo
Posted by George | August 18, 2025 | Hired Attorney
Clear, Concise and really knows his stuff, I totally recommend Mr Osborne. Everything I asked him to do for me was done without hesitation. Great all around
Posted by Scott Park | October 9, 2024 | Hired Attorney
Being a retired police detective I needed a solid attorney with skills that required a unique level. I have worked with Mark for over 20 years. I reached out to Mark to help me resolve what could have been a major problem. Within a month Mark resolved my legal issues. He is a very talented lawyer wit...
Posted by Stephanie | August 31, 2022 | Hired Attorney
Mark Osborne and his team worked extremely fast and were able to get a positive outcome in Nashua district court. Without his help I’d never have known what to do.
Posted by Brucemkt | May 25, 2022 | Consulted Attorney
I found out I had a legal issue in NH, It involved a lady that I used to date a couple years ago. I needed to hire a NH criminal lawyer to find out all the information regarding this case. Mr.. Osborne went above and beyond for me and he took the time to explain everything to me in great detail. I wo...
Posted by Esther | April 7, 2022 | Hired Attorney
Mark is an excellent, hard working, honest lawyer who will fight hard for you. I cannot recommend him enough. He changed our life by getting our case dismissed.
"It's always been a pleasure to work with Mark. He is always incredibly effective for his clients but also incredibly professional. I endorse this lawyer."
"Mark has had a great reputation in his area for a long time. But even better than his legal skills is his contribution back to the community. I've watched him as a volunteer judge for the High School Mock Trial competitions and his passion for the law and compassion for the youth is clear. Great lawyer, great citizen."
"I endorse this lawyer. I worked in the same courts with Attorney Osborne for many years. He is very professional, and strong advocate, and well respected in the legal community."
"Mark is very friendly, cares extremely about his clients, and is a great lawyer. I would recommend him for any criminal defense case."
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DUI and DWI lawyer
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Criminal defense lawyer
2013
Rising Star, Super Lawyers
2005 - 2007
Prosecuting Attorney, Hillsborough County Attorney's Office
2003 - 2005
Prosecuting Attorney, Hillsborough County Attorney's Office
2003 - 2005
Prosecuting Attorney, Rockingham County Attorney's Office
Not Guilty
2003
English