Claymen are a race of enemies in Mother 3. They are made by the Pigmask Army who mold ordinary clay into the likeness of a humanoid, then give the antenna atop the figure an electric shock which causes it to "come to life." This creation process was established by Dr. Andonuts. There are several factories throughout the Nowhere Islands where Claymen are birthed and recycled. Claymen are cheap to produce, and with their great strength, they make an efficient work force for the Pigmask Army. Claymen are also used for security purposes, such as when Duster and Wess are confronted by one at Osohe Castle while the site is locked down by the Pigmask Army. Later in the game, the main party encounters a Forlorn Junk Heap, an old, worn-out Clayman that has been thrown away and left to decompose in the dump. Part of the main storyline involves Lucas getting a "part time job" leading drained Claymen to recharge.

The Clayman can either bum rush (Like many enemies in Osohe Castle) or throw a punch for moderate damage or "Crush with all its weight" for immense damage but is left vunerable for a few turns.

Its battle sound is Battle Sound 6 which falls under Code Numbers 454 for regular attack, 455 for Smaaaash! and 456 for Miss.