1977–78 Welsh Cup

The 1977–78 FAW Welsh Cup is the 91st season of the annual knockout tournament for competitive football teams in Wales.

Key
League name pointed after clubs name.
 * CCL - Cheshire County League
 * FL D2 - Football League Second Division
 * FL D3 - Football League Third Division
 * FL D4 - Football League Fourth Division
 * NPL - Northern Premier League
 * SFL - Southern Football League
 * WLN - Welsh League North
 * WLS - Welsh League South

Fourth round
Nine winners from the Third round and seven new clubs.