The 1951 Cyclo-cross World Championship was the second edition of the UCI Cyclo-cross World Championships.
It was held on February 18th at the Baumbusch circuit in Luxembourg City, Luxembourg, on a 3.25-kilometer course that had to be lapped six times. Riders from seven countries participated, six with four participants, and the Netherlands alone with three. The race was won by 30-year old Roger Rondeaux.