Ironclad warship, wooden ships, or ships of composite construction, sheathed with thick iron plates for protection against gunfire or bolts or catapults

Ironclad, a steam locomotive on the Keighley and Worth Valley Railway

Operation Ironclad, the World War II British occupation of Diego Suarez, Madagascar

Legio VI Ferrata (Legion 6 Ironclad), a Roman legion (52 BC until middle-3rd century)

Ironclad (aka Mike Steel), one of the U-Foes, a Marvel comic book supervillain team

Ironclad, a 1973 miniatures wargaming series by Guidon Games

Ironclad Games, a video game developer

Ironclad, a type of Exide Battery for locomotive engine starting

Ironclads, a 1991 TNT television movie which was nominated for an Emmy Award for Outstanding Special Visual Effects

"Ironclad", a song by Sleater-Kinney from their 2000 album All Hands on the Bad One

"Ironclad", a song by Yngwie Malmsteen from his 2002 album Attack!!

Ironclad (video game), a shoot 'em up for the Neo Geo CD console

Ironclad (Common Lisp), a Common Lisp cryptography library