Paul Kostacopoulos is an American college baseball coach. He was the head coach of the Navy Midshipmen from 2006 until 2023. Prior to Navy, he was the head coach at both Maine and Providence. With the three programs, Kostacopoulos has appeared in a total of five NCAA tournaments.

The Maine Black Bears baseball team is the varsity intercollegiate baseball program of the University of Maine, located in Orono, Maine. It is the university's oldest athletic program, having begun play in 1881. It has been a member of the NCAA Division I America East Conference since its founding at the start of the 1990 season. Its home venue is Mahaney Diamond, located on the university's campus. Nick Derba is the head coach. He was named interim head coach prior to the 2017 season. The program has appeared in 16 NCAA tournaments and seven College World Series. In conference postseason play, it has won eight ECAC Tournaments and five America East tournaments. In conference regular season play, it has won five America East titles. 19 former Black Bears have appeared in Major League Baseball.