William John Patrick "Bill" McCarthy (22 May 1923 – 25 April 1987) was an Australian politician.
He was a Labor Party member of the New South Wales Legislative Assembly, representing Armidale from 1978 to 1981, and Northern Tablelands from 1981 to 1987.
McCarthy married Thelma on 8 March 1945, with whom he would have three children.
He served as a flying officer in the RAAF before becoming a grazier in 1959.
From 1970 to 1978 he was a field officer with the Community Development and Extension Division.In 1978, McCarthy was the Labor candidate for the Country Party-held state seat of Armidale; he narrowly defeated sitting MP David Leitch to win the seat.
In 1981 the seat was abolished, and McCarthy contested the new seat of Northern Tablelands, which was essentially a merger of the old seats of Armidale and Tenterfield.
Although the new seat had a notional National Country Party majority, McCarthy was elected.
McCarthy resigned due to ill health on 22 April 1987 and died 3 days later.
His widow Thelma was the Labor candidate in the resulting by-election but was defeated by National Party candidate Ray Chappell.