Leonard Peter Dondero (b. September 12, 1903 in Newark, CA – d. January 1, 1999 in Fremont, CA) was a Major League Baseball third baseman and second baseman who played with the St. Louis Browns in 1929. He attended Saint Mary's College of California.

Len appeared in 19 games (36 AB) for the Browns, collecting 6 hits, in his only MLB season.

Len was involved in one of the most bizarre baseball trades in 1930, when San Antonio Indian's (Texas League) owner Homer Hammond traded Lou to the Dallas Steers for 12 doughnuts. Len, however would never suit up for the Steers.

(excerpted from Baseball Almanac, BR Bullpen & Wikipedia)