Jan Diddens is a Belgian footballer, born 14 September 1906 in Mechelen (Belgium), died 21 July 1972.
Striker for Racing malinois and Belgium, he played two matches in the Olympic tournament in 1928 in Amsterdam, and two matches at the first World Cup in 1930 in Montevideo.
- International from 1926 to 1930 (23 caps, 2 goals)
- Participation in the 1928 Olympic Games (2 matches)
- Participation in the 1930 World Cup (2 matches)
- Promotion to D1 in 1925 with K.R.C. Mechelen