Donovan Casey (born February 23, 1996) is an American professional baseball outfielder who is a free agent.

A native of Stratford, New Jersey, Casey graduated from Sterling High School and played college baseball for Boston College.^[1] In 2017, he played collegiate summer baseball with the Chatham Anglers of the Cape Cod Baseball League.^[2] Casey was selected by the Los Angeles Dodgers in the 20th round of the 2017 MLB Draft. He played for the Ogden Raptors and Arizona League Dodgers in 2017, the Rancho Cucamonga Quakes in 2018 and the Quakes and Tulsa Drillers in 2019. He did not play a minor league game in 2020 since the season was cancelled due to the COVID-19 pandemic. On July 30, 2021, he was traded to the Washington Nationals (along with Josiah Gray, Gerardo Carrillo, and Keibert Ruiz) in exchange for Trea Turner and Max Scherzer.^[3]

Casey was selected as one of eight Nationals to participate in the Arizona Fall League in 2021, frequently leading off and playing center field for the Surprise Saguaros. On November 19, 2021, the Nationals selected his contract and promoted him to the 40-man roster for the first time.^[4] He was called up to the majors for the first time on April 15, 2022,^[5] but was optioned back several days later without appearing in an MLB game, becoming a phantom ballplayer.^[6] On August 9, Casey was designated for assignment following the waiver claim of Jake McGee.^[7] He elected free agency on November 6, 2023. ^[8]