I will be going to Japan for a business trip soon. Will having a DWI on my record be an issue for my entrance into the country?
It is my understanding that Japan will allow you into the country for 90 days without the need for a Visa. You should not have a problem.
If you are truly concerned you can call the Japanese Embassy before you go. The Japanese Embassy is located at 299 Park Avenue, New York NY 10171, and their phone number is 212-371-8222.