John Calvert

• John Calvert (1726–1804), British politician, MP for Tamworth, Wendover and Hertford
• John Calvert (died 1844), British politician, MP for Tamworth, Huntingdon, St Albans and Malmesbury
• John Calvert (magician), American magician
• John Calvert Griffiths, attorney general of Hong Kong
• John Calvert (scholar), American scholar of Islamism at Creighton University