Billy Lush (born November 30, 1981) is an American actor from New Haven, Connecticut. He last acted as Kevin Donnelly on the NBC drama The Black Donnellys, which was cancelled by NBC in April 2007.

William Lucas "Billy" Lush (November 10, 1873-August 28, 1951) was a Major League Baseball player who played 7 seasons with the Washington Senators (1895-97), Boston Beaneaters (1901-02), Detroit Tigers (1903), and Cleveland Naps (1904). Born in Bridgeport, Connecticut, Lush played in 489 major league games, including 461 as an outfielder. He had a career batting average of .249 and an on base percentage of .360 (fueled by 291 walks in 2,096 plate appearances). Lush led the American League with 34 sacrifice hits for the Tigers in 1903. And his .379 on base percentage for the Tigers in 1903 was 4th best in the American League, and his 70 bases on balls was 2nd best in the league. Lush was among the league leaders in walks 4 times. Lush was also a good fielder in the outfield. In 1902, Lush had 24 assists as the Beaneaters' center fielder, and a Range factor of 2.37 (0.44 points higher than the league average). For the Tigers in 1903, Lush had a Range factor of 2.42 (0.50 points higher than the league average).

Lush died in Hawthorne, New York in 1951 at age 77.