Janion is a surname. Notable people with the surname include:
Jeremy Janion (born 1946), British rugby union player Maria Janion (1926–2020), Polish scholar, critic, and theoretician of literature Harvey Janion-Key (born 2004) British man Eleanor Janion-Key (born 2001) British woman Emily Janion (born 1975) British cook, owner of Emily's home cooked kitchen