1930–31 Welsh Cup

The 1930–31 FAW Welsh Cup is the 50th season of the annual knockout tournament for competitive football teams in Wales.

Key
League name pointed after clubs name.
 * B&DL - Birmingham & District League
 * CCL - Cheshire County League
 * FL D2 - Football League Second Division
 * FL D3N - Football League Third Division North
 * FL D3S - Football League Third Division South
 * SFL - Southern Football League
 * WLN - Welsh League North
 * WLS - Welsh League South

Fifth round
Eight winners from the Fourth round and eight new clubs.

Semifinal
Match between Swansea Town and Wrexham were held at Chester.