The Absolute Dimensions of the Overcontact Binary FI Bootis UBVRCIC photometry of the W UMa eclipsing binaryFI Bootis has been obtained and analyzed simultaneously with previouslypublished photometry and radial velocities. The analysis of the lightand radial velocity curves shows that the system is an A-type W UMasystem consisting of stars with masses 0.82 and 0.31 Msolar.