Diāna Marcinkēviča (born 3 August 1992) is a tennis player from Latvia.

Marcinkēviča has won eight singles and 30 doubles titles on the ITF Women's Circuit.

On 28 April 2014, she reached her best singles ranking of world No.

Playing for Latvia Fed Cup team, she has a win–loss record of 24–31, as of July 2024.

Marcinkēviča recorded her first win on the WTA Tour as a wildcard at the 2019 Baltic Open when she beat wildcard Kamilla Rakhimova, in straight sets.