The role of best man is a ceremonial position at both magical and muggle weddings. The role is generally chosen by the groom, and is therefore normally occupied by someone close to him. At the Wedding of James Potter and Lily Evans Sirius Black was chosen as the best man as he was the best friend of the groom. Similarly, the best man at the Wedding of William Weasley and Fleur Delacour was Charles Weasley, the eldest brother of the groom. It is possible that, as in the Muggle world, the best man is usually made the godfather of the wedded couple's first child. This theory is supported by the fact that Sirius Black became the godfather of Lily and James Potter's eldest child.

Known best men

• Sirius Black (Best man at the Wedding of James Potter and Lily Evans in 1978)
• Charles Weasley (Best man at the Wedding of William Weasley and Fleur Delacour in 1997)
• Harry Potter (Possible Best man at the Wedding of Ronald Weasley and Hermione Granger)
• Ronald Weasley (Possible Best man at the Wedding of Harry Potter and Ginerva Weasley)

Appearances

• Harry Potter and the Deathly Hallows
• Harry Potter and the Deathly Hallows: Part 1 (Possible appearance)
• LEGO Harry Potter: Years 1-4 (Appears on a picture)