William Peter "Liam" Clifford (27 June 1876 – 24 February 1949) was the ninth president of the Gaelic Athletic Association (1926–1928).

Involved in the dairy co-operative movement in Limerick and neighbouring Clare for many years, Clifford became the Department of Agriculture’s chief dairy inspector in 1936.^[1]

Clifford was chairman of the Limerick county board for 20 years, and also had a term as chairman of the Munster board.^{[citation needed]}

Under Liam Clifford's leadership, the Tipperary team toured America.^[2] Brendan Fullam stated ‘the Tipperary hurling team – All-Ireland champions of 1925 – boarded the SS Bremen in early May and set forth on a most successful tour of the States’.^[3]

Additionally, during Clifford's presidency, the GAA decided to allocate ten percent of gate receipts for ground development, which led to the provision of grounds throughout the country,^[4] for which Clifford has been called "the great apostle of grounds development".^[5] Therefore, Clifford was described as ‘the first President to encourage the various County Committees to purchase and develop grounds to be used exclusively for Gaelic Games’.^[6] Eamonn Sweeney stated ‘in the implementation of Clifford’s grounds programme; the GAA was unrivalled in its ability to provide grounds and facilities in the smallest of villages and towns’.^[7]