William John Hewitt (6 June 1928 — 15 May 2019) was an Irish international rugby union player.
Hewitt was born in Belfast and learned his rugby at the Royal Belfast Academical Institution, where he was a member of the 1945 Ulster Schools' Cup-winning side.
He played his rugby club for Instonians.
[1] An out-half, Hewitt had limited opportunities for Ireland due to the presence of Jack Kyle and was capped four times between 1954 and 1961, with two of his appearances coming as a wing three-quarter.
He was a member of Ireland's 1952 tour of South America and earned his final cap against the Springboks in Cape Town on the 1961 South African tour.