William Wright Regan (January 23, 1899 – June 11, 1968) was a second baseman in Major League Baseball who played from 1926 through 1931 for the Boston Red Sox (1926–1930) and Pittsburgh Pirates (1931). Listed at 5 ft 10 in (1.78 m), 155 lb., Regan batted and threw right-handed.

A native of Pittsburgh, Pennsylvania, Regan was a World War I veteran who played semi-pro baseball before starting his professional career in 1922. He played for the Kitchener and Flint teams of the Michigan-Ontario League, and later moved on to the Columbus Senators of the American Association. In 1925 hit a .298 batting average for Columbus, and .317 in 38 games in 1926, before joining the Boston Red Sox during the midseason to become the team's regular second baseman for the next five years.

Basically a line drive hitter and smart baserunner, Regan had good contact and was able to convert his gap line drives into extra bases. In 1927 recorded career-numbers with 37 doubles and 10 triples, while hitting .274 in 129 games. His most productive season came in 1928, when he posted career-highs with seven home runs and 75 RBI, while collecting 30 doubles and six triples. On June 16 of that year, he came to bat twice in an inning and homered both times. His second was an inside-the-park homer, as he equaled his HR output of the previous season. Besides this, he was considered in the American League MVP vote in both years.

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