Swaffer is a surname. Notable people with the surname include:

• Hannen Swaffer (1879–1962), English journalist and drama critic
• John Swaffer (1851—1936), English criketer
• Kristyn Swaffer (born 1975), Australian football player
• Patrick Swaffer (born 1951), British film industry executive

• Sir John Richard Hicks
• Sir John Robert Kerr
• Sir John Rodgers, 1st Baronet
• Sir John Rose
• Sir John Ross
• Sir John Seymour
• Sir John Sherbrooke (Halifax)
• Sir John Simon
• Sir John Sinclair, 1st Baronet
• Sir John Smyth, 1st Baronet
• Sir John Soane
• Sir John Soane's Museum
• Sir John Sparrow David Thompson
• Sir John Squire
• Sir John Stainer
• Sir John Stanier
• Sir John Stanley
• Sir John St Aubyn, 5th Baronet
• Sir John Steell
• Sir Johnston Forbes-Robertson
• Sir John Strathearn Hendrie
• Sir John Suckling
• Sir John Sulman Prize
• Sir John Swinburne, 7th Baronet
• Sir John Taylor Coleridge