The 2017–18 FAW Welsh Cup was the 131st season of the annual knockout tournament for competitive football teams in Wales.
The winners Connah's Quay Nomads qualified for the 2018–19 UEFA Europa League preliminary round.
First qualifying round The draw for the first qualifying round was held on 12 July 2017. The draw was regionalized into six sections: South East, South Central, South West, Central, North West and North East. All matches were played on 19 August 2017.
South East region
South Central region
The Aber Valley/Cardiff Corinthians and Merthyr Saints/Tiger Bay ties had been reversed.
South West region
Central region
North East region
North West region
Second qualifying round The draw for the second qualifying round was held on 21 August 2017. The draw was regionalized into five sections: South East, South West, Central, North West and North East. Matches were played on 9 September 2017 with the exception of Mynydd Llandygai/Mochdre Sports which was played on 23 September 2017 . Treharris Athletic Western were disqualified for fielding an ineligible player and Llanrumney United replaced them.
South East region
South West region
Central region
North East region
The Mold Alexandra/Acton, Penycae/Llay Welfare and Llanuwchllyn/Chirk ties were reversed from the original draw.
North West region
Glantraeth FC were due to play Prestatyn Sports but withdrew.
First round The draw for the first round was held on 11 September 2017.
Results:
!colspan="3" align="center"|6 October
!colspan="3" align="center"|7 October
Second round The draw for the second round was held on 8 October 2017.
Results:
!colspan="3" align="center"|4 November
Third round The draw for the third round was held on 6 November 2017.
Results:
!colspan="3" align="center"|1 December
!colspan="3" align="center"|2 December
!colspan="3" align="center"|3 December
Fourth round The draw for the fourth round was held on 4 December 2017.
Results:
!colspan="3" align="center"|26 January
!colspan="3" align="center"|27 January
Quarter-finals The draw for the quarter-finals was held on 29 January 2018.
Results:
!colspan="3" align="center"|4 March
!colspan="3" align="center"|6 March
Semi-finals The draw for the semi-finals was held on 5 March 2018. The matches were played at neutral venues.
Results:
!colspan="3" align="center"|7/8 April
Final The final was played on 6 May 2018.
!colspan="3" align="center"|6 May
References