Misaki Doi (土居美咲, Doi Misaki, born 29 April 1991) is a Japanese professional tennis player. She is left-handed and uses a two-handed backhand. Her highest WTA singles ranking is 30, which she reached on 10 October 2016. Her career high in doubles is 78, which she reached on 6 October 2014.
Doi reached two junior grand slam doubles finals – at Wimbledon in 2007 with Kurumi Nara, and at the Australian Open in 2008, with Elena Bogdan (losing both). She is managed by Muse Group, a sports marketing agency based in Tokyo.
Doi began playing tennis at the age of 3. She first distinguished herself in tennis as a middle-school student, reaching the semifinals of the All Japan Middle School Tennis Championships in both 2004 and 2006 and joining the ITF Junior Circuit in 2006. In 2007, while enrolled as a freshman in Sundai Kōei High School, Doi earned second place in the Japan Open Junior Championships in Nagoya.