William John Clancy (17 June 1906 – 14 December 1967) was an Irish hurler who played as a left corner-forward for the Cork senior team.
Clancy was a member of the Munster inter-provincial team on a number of occasions, however, he never won a Railway Cup medal.
The high point of his career, and indeed the highpoint of the club's history, came in 1928 when Mallow played Éire Óg in the final of the senior county championship.
[citation needed] Clancy first came to prominence on the inter-county scene as a member of the extended Cork panel in 1929.
He was an unused substitute that year as Cork claimed Munster and All-Ireland honours following respective defeats of Waterford and Galway.
On 6 July 1930 Clancy made his senior championship debut in a 6–6 to 5-6 Munster semi-final defeat by Clare.
Kilkenny's Lory Meagher was playing the best hurling of his career at this time and scored a magnificent point from 90 yards out the field.
It was also suggested at a meeting of Central Council that both teams be declared joint champions and that half an All-Ireland medal by given to each player.
As the All-Ireland saga went to a third meeting on 1 November 1931, Kilkenny's captain Meagher was ruled out of the game because of broken ribs sustained in the first replay.