The 1963 International Cross Country Championships was held in San Sebastián, Spain, at the on 17 March 1963. The distance for the men's race was reduced from the traditional 9 miles (14.5 km) to 7.5 miles (12.1 km). A preview of the event was given in the Glasgow Herald.
Complete results for men, junior men, medalists, and the results of British athletes were published.
An unofficial count yields the participation of 125 athletes from 11 countries.