Betty Wanless [Decker] (August 28, 1928 – December 20, 1995) was an infielder who played from 1953 through 1954 in the All-American Girls Professional Baseball League.

[1] Betty Wanless played in the rival National Girls Baseball League of Chicago before joining the AAGPBL during its last two seasons.

Nicknamed ״Duke״ by her teammates, she reportedly hit the longest home run ever recorded at the old Grand Rapids ballpark, which was estimated at 425 feet.

[2] Wanless entered the league in 1953 with the Grand Rapids Chicks, to form part of a solid infield that included Inez Voyce at first base, Eleanor Moore or Alma Ziegler at second, and Marilyn Olinger at shortstop.

Wanless batted a .248 average with a .309 on-base percentage and a .291 of slugging, driving in 35 runs and scoring 49 times, while her 48 stolen bases ranked for the tenth best in the league.