The 1934–35 Challenge Cup was the 35th staging of rugby league's oldest knockout competition, the Challenge Cup.

[1] Castleford beat Huddersfield 11–8 in the final at Wembley before a crowd of 39,000.

This was Castleford’s first Challenge Cup final win in their first final appearance, and Huddersfield’s first defeat in six final appearances.

[2] By agreement between the RFL and the French Rugby League, Castleford advanced to an international unification game against inaugural French Cup winners US Lyon-Villeurbanne, which was played near Paris and won by the English side on a score of 24–21.

[3]