Sidney James Day VC (3 July 1891 – 17 July 1959) was an English recipient of the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces. Day originally enlisted in the 9th Sussex Regiment. However, after being seriously wounded in four places during the Battle of the Somme, he was invalided back to England, spending several months in hospital near his home. Upon discharge, he returned to duty as a corporal with the 11th Battalion (Cambridge Suffolks), The Suffolk Regiment.