Mari Ozaki (????, Ozaki Mari, born 16 July 1975 in Hirakata, Osaka) is a Japanese long-distance runner who specializes in the marathon race.
She was the 2002 winner of the Kagawa Marugame Half Marathon, taking the title in 1:09:33.
She ran at the 2010 London Marathon and finished in ninth place with a time of 2:25:43.