Jarkko Ruutu (pronounced Yar-ko Roo-too; born August 23, 1975 in Vantaa, Finland) is a Finnish professional ice hockey forward for the Ottawa Senators of the National Hockey League (NHL). He is the brother of Tuomo Ruutu, also currently playing in the NHL, and retired player Mikko Ruutu.

Ruutu initially moved to North America to play college hockey with Michigan Tech of the Western Collegiate Hockey Association (WCHA). After his freshman year, however, he returned to Finland and turned professional with HIFK of SM-liiga in 1996–97. In his draft year, he recorded 20 points in 37 games and was then drafted by the Vancouver Canucks in the third round, 68th overall, in the 1998 NHL Entry Draft. He played one more season with HIFK before moving back to North America to play for the Canucks' minor league affiliate, the Syracuse Crunch of the American Hockey League (AHL).

Ruutu played his first full season with the Canucks in 2001–02 and earned himself a reputation as one of the league's most effective "pests" or "agitators". During the 2004–05 NHL lockout, Ruutu played once more for HIFK and set a SM-liiga record for penalty minutes in a single season with 215 (since broken by Matt Nickerson).