Jeffrey Michael Bajenaru (Romanian: Băjenaru; born March 21, 1978) is an American former professional baseball pitcher and current pitching coach for the Hillsboro Hops, the Single-A affiliate of the Arizona Diamondbacks.

Bajenaru was born in Pomona, California and graduated from Ruben S. Ayala High School in Chino Hills.

[2] Bajenaru has generally worked as a closer during his minor league career, striking out more than 10 batters per nine innings, and collecting 24 wins and 91 saves in relief.

After brief stints in their bullpen in 2004 and 2005, he was traded to the Diamondbacks on March 8, 2006, with the White Sox receiving infielder Alex Cintrón.

Bajenaru missed the entire 2007 season and ended up retiring from professional baseball in 2008 due to two separate shoulder surgeries.