Haydn James Mainwaring (10 June 1933 — 12 September 2018) was a Welsh international rugby union player.
Mainwaring was born in Swansea and educated at Bishop Gore School.
[1] A versatile back, Mainwaring played with Swansea, Royal Navy, London Welsh, Harlequins and Newport.
He also made several Barbarians appearances, mostly famously as a fullback against the touring 1961 Springboks, with his try-saving shoulder charge on Avril Malan helping secure a 6–0 win.
[3] He won his solitary Wales cap as a centre in a 1961 Five Nations match against France in Paris.