The FAI Cup 1926-27[A] was the sixth edition of Ireland's premier cup competition, The Football Association of Ireland Challenge Cup or FAI Cup.
The tournament began on 8 January 1927 and concluded on 9 April with the final replay held at Shelbourne Park, Dublin.
An official attendance[B] of 10,000 people watched Leinster Senior League side Drumcondra defeat Brideville in the first final to be decided in extra time.
Drumcondra completed a cup double having already won the FAI Intermediate Cup A.
^ Attendances were calculated using gate receipts which limited their accuracy as a large proportion of people, particularly children, attended football matches in Ireland throughout the 20th century for free by a number of means.