The actor and stand-up comic previously recurred as cop Dave Sanderson throughout the NBC's comedy's second season.
A former love interest of Leslie Knope (Amy Poehler), Dave left Pawnee to take a job in San Diego. The character will reappear in an early 2012 Parks episode, according to TVLine.
Louis CK currently stars in his own FX sitcom Louie, which has been picked up for a third season.
His film appearances include 2008 comedy Role Models and 2009's The Invention of Lying.
Former Free Agents star Kathryn Hahn has also joined Parks and Recreation in a recurring role.
The actress will play a political operative who becomes involved with Leslie Knope's run for City Council.
Parks and Recreation airs on Thursdays at 8.30/7.30c on NBC.
Watch a clip from Parks and Recreation below: