George Day (born in Shropshire, England, c. 1501 – died 2 August 1556) was the Bishop of Chichester.
He graduated at the University of Cambridge in 1520–21, and became a Fellow of St. John's College, Cambridge on 19 September 1522. Though apparently always a Catholic in belief, Day submitted to the assumption by Henry VIII of ecclesiastical supremacy.
He was made Master of St John's in 1537, Vice-Chancellor of Cambridge University, and Provost of King's College, Cambridge (though not a fellow of it) by special exercise of the royal authority, in 1538. Consecrated Bishop of Chichester in 1543 by Thomas Cranmer, he firmly opposed the spread of the Protestant Reformation under Edward VI.
He answered in a Catholic sense Cranmer's written questions on the "Sacrament of the Altar", defended the Catholic doctrine in the House of Lords, and voted against the bills for Communion under both kinds, and for the introduction of the new Prayer Book. In his own diocese his preaching was so effective that, in October 1550, the Council felt it necessary to send "Dr. Cox, the king's almoner, to appease the people by his good doctrine, which are troubled through the seditious preaching of the Bishop of Chichester and others."