Patrick Tam may refer to:

• Patrick Tam (film director) (born 1948), Hong Kong film director
• Patrick Tam (actor) (born 1969), Hong Kong actor and singer
• Patrick Tam (biologist), Australian microbiologist

• John de Graham
• John DeGroff
• John de Halghton
• John De Haven
• John de Havilland (officer of arms)
• John de Hawkwood
• John de hawkwood
• John Dehner
• John de Horncastle
• John de Innes
• John de Jong
• John deJongh
• John de Jongh Jr.
• John De Kirkeby
• John De la Bere
• John Delamare
• John De Lancie
• John Delaney
• John Delaney (football administrator)
• John de La Poer Beresford, 4th Marquess of Waterford
• John de la Poer Beresford, 4th Marquess of Waterford
• John de la Poer Beresford, 5th Baron Decies
• John de La Poer Beresford, 5th Marquess of Waterford
• John de La Poer Beresford, 8th Marquess of Waterford
• John de la Pole, Earl of Lincoln