Harris Academy Riverside is a coeducational secondary school and sixth form located in Purfleet in the Thurrock unitary authority, Essex, England. Purfleet is bordered by the A13 road to the north and the River Thames to the south and is within the easternmost part of the M25 motorway but just outside the Greater London boundary. As its name suggests, the school is on the riverside, but separated from the water by a railway line.