The Meru or Amîîrú (including the Ngaa) are a Bantu ethnic group that inhabit the Meru region of Kenya. The region is situated on the fertile lands of the north and eastern slopes of Mount Kenya in the former Eastern Province.

The word Meru means 'shining light' in the Meru language. Ameru in the Meru language means 'the shining ones' or 'the children of the shining one'. The Ameru people comprise nine subgroups: the Igoji, Imenti, Tigania, Mitine, Igembe, Mwimbi, Muthambi, Chuka and Tharaka. The Tharaka live in the semi-arid part of Greater Meru and they, along with the Mwimbi, Muthambi and Chuka, form the Tharaka-Nithi County. The Ameru are unrelated to the Wameru of northern Tanzania.