Kelsie Ann-Gamboa Whitmore (born July 5, 1998) is an American professional baseball pitcher and outfielder for the Oakland Ballers of the Pioneer League.

[1] Whitmore received a fifth year of eligibility from the National Collegiate Athletic Association due to the cancellation of the 2020 season because of the COVID-19 pandemic.

[3][4][5] While she attended high school, Whitmore joined the United States women's national baseball team.

[1] Whitmore also participated in the 2018 Women's Baseball World Cup, as the United States finished in fourth place.

[14][15] On April 8, 2022, Whitmore signed with the Staten Island FerryHawks of the Atlantic League of Professional Baseball.

[13] On May 4, Whitmore became the first woman to pitch in an Atlantic League game when she made her first pitching appearance for Staten Island; entering the game with the bases loaded and two outs, she retired Ryan Jackson, a former major leaguer, on a fly out to end the inning.

[18] For the 2022 season, Whitmore batted .026 (a single in 39 at-bats), while on the mound allowed 14 earned runs in 10 1/3 innings for a 12.19 ERA.