Justin Mapletoft (born January 11, 1981) is a Canadian former professional ice hockey centre.

He played 38 NHL games with the Islanders in addition to his four seasons with the Bridgeport Sound Tigers in the AHL.

After being recommended by his Tigers linemate Sean Bergenheim, Mapletoft signed with Jokerit in the Finnish SM-liiga for the 2005–06 season, but after a disappointing early season, the team invoked a buyout clause in his contract at the beginning of November 2005, ending his season with Jokerit.

[1][2] He subsequently signed with Södertälje SK in the Swedish Elitserien.

He played two seasons for the Straubing Tigers of the Deutsche Eishockey Liga.