Rooker is a surname, and may refer to:
Brent Rooker (born 1994), American professional baseball player Jeff Rooker, Baron Rooker (born 1941), British politician Jim Rooker (born 1942), American baseball player and broadcaster Michael Angelo Rooker (1746–1801), English painter, illustrator and engraver Michael Rooker (born 1955), American actor
You may also be looking for the Rooker-Feldman Doctrine relating to United States legal procedure.