Mary Jane Farell (1920 - 5 October 2015) was an American bridge player. She won major tournaments as Mary Jane Kauder too.
Farell grew up in Cincinnati, Ohio, and "couldn't wait to get home from school to kibitz whenever my mother had the game at our house." The family moved to Los Angeles when she was 17 and she began playing duplicate bridge there "with the young men I dated". She married one of them, Arnold Kauder, who was her mentor. (They divorced.) She began teaching bridge after World War II.
Mary Jane and Arnold Kauder won the Hilliard Mixed Pairs (a secondary "national" championship after 1946) in 1949 and finished second in 1950. They were second again in 1957, behind Bob Adams and Marilyn Johnson. Johnson and Mary Jane Farell became a strong partnership and won three world championships together.
Her second husband Jules Farell died in 2005.
Farell was inducted into the ACBL Hall of Fame in 1998.