Jonathan Rashleigh Knight (born November 29, 1968) is an American singer. Along with his younger brother Jordan he is part of the musical group New Kids on the Block (NKOTB). The band also includes Donnie Wahlberg, Joey McIntyre, and Danny Wood. Jonathan Knight is the oldest member of the group and was the first to leave the group in 1994 prior to their official disbanding.

Between 1984 and 1994, Knight was a member of an award-winning American pop group New Kids on the Block. The group went on to sell over 70 million albums worldwide before disbanding in 1994 after Knight left the group during the tour for their 1994 album Face the Music. The group originally tried to continue the tour claiming Knight had been injured by a horse before revealing they were instead disbanding in a press conference a few weeks later. Knight's early departure from the group lead to reports that some members were frustrated with the way he departed and that those feelings prevented an earlier reformation of the group.

In the spring of 2008, Knight returned to show business, reuniting with the other four members of New Kids on the Block. The band released their seventh album (and first in fourteen years), The Block, on September 2, 2008. To confirm their reunion and announce the new album, the band performed live together on May 16, 2008 for the first time in fifteen years on the Today Show.