The FAI Cup 1928–29[A] was the eighth edition of Ireland's premier cup competition, The Football Association of Ireland Challenge Cup or FAI Cup.
The tournament began on 5 January 1929 and concluded on 6 April with the final replay held at Shelbourne Park, Dublin.
An official attendance[B] of approximately 15,000 people watched Shamrock Rovers win the first of five FAI Cup titles in a row by defeating holders Bohemians.
^ From 1923 to 1936, the FAI Cup was known as the Free State Cup.
^ 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.