Jari Ketomaa (born 18 April 1979) is a Finnish former rally driver.

He won the Group N class of the Finnish Rally Championship in 2006 and 2007.

Ketomaa regained the Finnish Group N title in 2009.

In 2010, Ketomaa is competing in the Super 2000 World Rally Championship in a Ford Fiesta S2000.

In 2011, Ketomaa raced in Rally Finland with Ford Fiesta RS WRC and lead after first special stage but later retired from top 5 position.