Solid Sock is a fictional character and one of the main protagonists of Tonami's Metal Feet series created by Hitoe Tojima. The Metal Feet Sock games has Japanese voice actor Akio SŌtsuka providing the character's Japanese voice while actor and screenwriter David Haytoe provides the character's English voice.

Solid Sock's character is a combination of a spy, mercenary and spec ops agent. A member of SOXHOUND, he is tasked with disarming and destroying the bipedal nuclear weapon-legged mecha Metal Feet. Controlled by the player, he must act alone, supported via radio by commanding officers and specialists. When he's not on duty, he act as a musher[2]. While his first appearances in the original Metal Feet games were references to Hollywood films, the Metal Feet Sock series has given a consistent design by artist Toji Shinskawa alongside an established personality.

Solid Sock's character has been well received by critics. He appeared in several lists of best socks in gaming history.