Guillermina Grant (born 22 June 2002) is a Uruguayan tennis player, who played at the Uruguay on the Fed Cup since 2017.
Grant has a career-high ITF juniors ranking of 31, achieved on 2 March 2020.
In December 2020, Grant signed with the Georgia Bulldogs college team for the 2021-22 season.
Grant made her Fed Cup debut for Uruguay in 2017, while the team was competing in the Americas Zone Group II, when she was 15 years and 27 days old.