William Percival Grieve, QC (25 March 1915 – 22 August 1998) was a British Conservative Party politician.

Grieve was educated at Trinity Hall, Cambridge. He became a barrister, and was called to the bar at Middle Temple in 1938, and a Queen's Counsel in 1962. He was assistant recorder of Leicester 1956-65 and became recorder of Northampton in 1965 and Deputy Chairman of Lincoln (Holland) Quarter Sessions in 1962.

Grieve contested the 1962 Lincoln by-election, where he lost heavily to Labour's Dick Taverne. At the 1964 general election, he was returned as Member of Parliament (MP) for Solihull, and re-elected until his retirement from Parliament at the 1983 general election. He briefly employed the slogan "Grieve for Solihull".^[1]

He married, in 1949, Evelyn Raymonde Louise (d. 1991), daughter of Commandant Hubert Mijouain, of Paris, and maternal granddaughter of Sir George Roberts, 1st and last baronet.^[2] Their son Dominic Grieve, KC, PC, was elected MP for Beaconsfield at the 1997 general election, and became Attorney General for England and Wales in May 2010.