Human

Humans are the majority of Earth's population and most of them don't know the existance of merpeople.

Major Human

 * Lewis McCartney: Lewis is a main character and has an is a major human of H2O: Just Add Water.
 * Zane Bennett: Zane is a major recurring character of H2O: Just Add Water and a character that keeps the secret of mermaids.
 * Will Benjamin: Will is a main character of H2O: Just Add Water and is one of the characters that keeps the secret.
 * Cam Mitchell: Cam is a major recurring character of H2O: Mako: Island of Secrets and is one of the characters that keeps the secret.
 * Charlotte Watsford: Charlotte is a major recurring character of H2O: Just Add Water and one of the characters that keeps the secret. She is also a former mermaid.

Former Humans

 * Cleo Sertori: Cleo is a main character of H2O: Just Add Water and one of the characters that became a mermaid.
 * Rikki Chadwick: Rikki is a main character of H2O: Just Add Water and one of the characters that became a mermaid.
 * Emma Gilbert: Emma is a main character of H2O: Just Add Water and one of the characters that became a mermaid.