Jaynne Berrier Bittner [JB] (March 17, 1926 – April 23, 2017) was an American starting pitcher who played from 1948 through 1954 for four teams of the All-American Girls Professional Baseball League.

An AAGPBL scout signed her after seeing her basketball prowess, thinking that she had athletic abilities, endurance and fitness necessary to play baseball.

She attended a league tryout in Allentown, Pennsylvania, and later was sent to the 1948 spring training held in Cuba.

[2] Bittner entered the league in 1947 with the South Bend Blue Sox, playing for them one year before joining the Muskegon Lassies (1948), Grand Rapids Chicks (1949–52) and Fort Wayne Daisies (1952–53).

Although she led the league in wild pitches (13) in 1949 and the following year issued the most balks (five), Bittner emerged in 1951 with Grand Rapids posting a 15–8 mark and a 2.95 ERA.