Thomas Chafin, Chaffin or Chaffyn may refer to:

• Thomas Chaffyn (died 1558), MP for Salisbury 1529
• Thomas Chaffyn (died 1559), MP for Salisbury 1555 and Heytesbury 1554
• Thomas Chaffin, High Sheriff of Dorset in 1579
• Thomas Chaffin, High Sheriff of Dorset in 1590
• Thomas Chafin (1650–1691), MP for Poole 1679–87, Dorchester 1689 and Hindon 1690–1
• Thomas Chafin (1675–1711), MP for Shaftesbury 1699–1701 and Dorset 1702–11

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