Pig iron is an intermediate form of iron produced from iron ore.

Pig iron may also refer to:

• Pig Iron – The Album, by Anti-Nowhere League
• Pig Iron Theatre Company, a theater group located in Philadelphia, PA, US
• Robert Menzies (1894–1978), Australian Prime Minister known as "Pig Iron Bob"
• Peter Porkchops, a character from the DC Comics series Captain Carrot and His Amazing Zoo Crew, known as Pig-Iron