1937–38 Welsh Cup

The 1937–38 FAW Welsh Cup is the 57th 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
 * MWL - Mid-Wales Football League
 * ML - Midland League
 * SFL - Southern Football League
 * WLN - Welsh League North
 * WLS D1 - Welsh League South Division One
 * WCL - West Cheshire League
 * W&DL - Wrexham & District Amateur League

Second round
20 winners from the first round plus Haverfordwest Athletic and Lovell's Athletic.

Third round
10 winners from the second round plus 14 new clubs. Llanelly get a bye to the fourth round.

Fourth round
12 winners from the third round, Llanelly and one new team - Worcester City.

Fifth round
Four winners from the fourth round. Cheltenham Town, Shrewsbury Town and Worcester City get a bye to the Sixth round.

Sixth round
Two winners from the fifth round, Cheltenham Town, Shrewsbury Town and Worcester City and eleven new clubs.

Semifinal
Swansea Town and Rhyl played at Chester.

Final
Both final and replay were held in Shrewsbury.