Jonathan Paul "J.P." Losman (born March 12, 1981 in Los Angeles, California) is an American football player for the Buffalo Bills franchise.

The Bills drafted Losman, a quarterback who played collegiately at Tulane, in 2004 with the 22nd pick in the first round of the NFL Draft. As of late 2004, he had made brief appearances in three games, completing three of five passes for 32 yards and one interception while backing up Drew Bledsoe.

Losman grew up in Venice, California, the son of an American father and Mexican mother and played quarterback at Venice High School. He attended college at UCLA and transferred to Tulane.

In 2002, in his first year as a full-time starter, Losman led the Green Wave to an 8-5 record and a victory in the inaugural Hawaii Bowl.

Losman finished his college career having completed 570 of 987 passes (57.7 percent) for 6,754 yards, 60 touchdowns and only 27 interceptions. He also ran for 241 yards with 10 scores on 237 carries.

Following the Buffalo Bills' February 2005 release of Drew Bledsoe, Losman was named the team's starting quarterback by head coach Mike Mularkey.