R55

R55 may refer to:

Roads

 * R55 expressway (Czech Republic), now the D55 motorway
 * R55 (South Africa), a road

Other uses

 * R55 (New York City Subway car)
 * K-55 (missile), a Soviet air-to-air missile
 * Mini Clubman (R55), a car
 * R55: Toxic to fauna, a risk phrase