William Francis "Bad Bill" Mizeur (June 22, 1897 – August 27, 1976) was a pinch hitter in Major League Baseball.

He spent the year with the Terre Haute Tots of the Illinois–Indiana–Iowa League, batting .327, and hitting 11 home runs.

He put up his best numbers in 1927, setting career-highs in six offensive categories: batting average (.354), slugging percentage (.618), total bases (325), hits (186), triples (19), and home runs (23).

[2] He eventually finished behind teammate Red Smith for the batting title, but Mizeur did lead the league in total bases, hits, triples, and homers.

In August 1934, he took over as manager for the Western League's Cedar Rapids Raiders for the last part of the season.