Louise Veronica Arnold [Lou] (May 11, 1923 – May 27, 2010) was a female pitcher who played during four seasons for the South Bend Blue Sox of the All-American Girls Professional Baseball League.

Compared to softball, the crucial differences were that nine (not ten) players were used, and runners could lead off, slide and steal bases.

These differences varied from the beginning of the league, progressively extending the length of the base paths and pitching distance and decreasing the size of the ball until the final year of play in 1954.

For the first five years the circuit used a fastpitch underhand motion, shifted to sidearm in 1947, and never really became baseball until overhand pitching began in 1948.

She is also part of the AAGPBL permanent display at the Baseball Hall of Fame and Museum at Cooperstown, New York, opened in 1988,[8] which is dedicated to the entire league rather than any individual player.