The Milwaukee Grays were a short-lived baseball team that spent one year, 1878, in the National League.
The team was part of the League Alliance, loosely affiliated with the National League, in 1877. It won 19 games and lost 13 (including a 10–7 loss to the Chicago White Stockings of the NL), ending up in fourth place. "The team's sharp style and strong hometown support won them a National League berth in 1878."
They won 15 games and lost 45 in 1878, finishing sixth and last in the league. Their home games were played at Eclipse Park II.
The Grays were managed by former major league right fielder Jack Chapman, whose nickname was "Death to Flying Things." Their best hitter was left fielder Abner Dalrymple, who led the team in batting average (.354), slugging percentage (.421), runs (52), and doubles (10). Their top pitcher was Sam Weaver, who was only 12–31 but had the fourth-best ERA in the league, a very low 1.95.