Iron ingot is a crafting component in The Witcher 3: Wild Hunt that can be dismantled into iron ore. It is needed to craft the following items:
Crafting Requirements 
It can be found as random loot or purchased from the following merchants:
- All armorers and blacksmiths
- Armors and weapons merchants in Nilfgaardian Army Group 'Center' Camp
- Merchant in the boatyard south of Refugees' Camp
- Merchant at Calveit Watchtower
- Merchant at Coast of Wrecks
- Merchant in Ursten
- Merchant by the road west of White Eagle Fort
- Merchant at the sawmill northeast of Rannvaig
- Merchant at the Isolated Hut on Hindarsfjall
- Merchant in Mohrin Village
- Merchant in Stacheier
Iron ingots can also be obtained by dismantling:
- Candelabrum
- Dorian sword
- Forgotten vran sword
- Harvall
- Headhunter
- Iris
- Koviri cutlass
- Mourner
- Nilfgaardian longsword
- Novigrad longsword
- Rusty Nilfgaardian sword
- Rusty Novigrad sword
- Rusty Skellige sword
- Rusty Velen sword
- Skellige longsword (crafted)
- Steel ingot
- Steel shortsword
- Teigr
- Temerian poniard
- Ultimatum
- Velen longsword
- Warrior's leather jacket
- Witcher's steel sword
- Witch hunter's sword (basic)
- Feline steel sword
- Legendary Feline steel sword
- Viper steel sword
- Legendary Viper steel sword