Emma Gilbert is one of the three main characters in Nickelodeon's H2O: Just Add Water. The series takes place on the Gold Coast of Australia. A strange encounter with the magical moonpool on Mako Island turns the girls into mermaids! Now Emma, Cleo, and Rikki must navigate life as a human on land and mermaid in the water. Emma is the responsible one of the group, though she can sometimes act bossy. Her mermaid power is freezing water. Claire Holt, known for her later role in The Vampire Diaries, portrayed this character in the first two seasons.

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