Henry's Mum, or simply Mum, is a supporting character in Horrid Henry. She is...well, the mother of Horrid Henry, as well as Perfect Peter, and is Silly Simon's wife. She almost always tells Henry off, mostly due to Peter telling on him due to Henry's torment towards him him. She regularly says, "Don't be horrid, Henry!" to Henry whenever he's being Horrid, and much like Simon, she usually sends Henry to his room whenever he misbehaves. Unlike Simon, the series didn't reveal her first name. Therefore, it is unknown what her actual name is. She also dislikes Moody Margaret after an incident where Margaret threw Peter in the trash, and Henry revealed what she did.
Henry's Mum appears an an NPC in All Star Smashers. If Peter gets summoned as an Assist Trophy, and someone falls asleep during his violin performance, he will call out to his mum, who will then kick the opponent due to their disgraceful behaviour.
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Whenever Henry torments Peter, he will often call out to his mum to deal with Henry.