Antero Warelius (14 July 1821 – 16 January 1904) was a Finnish priest and writer.
Warelius was born in the village of Varila, part of the municipality of Tyrvää, Satakunta county.
He studied at the University of Helsinki, where he became interested in the academic ambitions of the Finnish language, and with support of the Russian Academy of Sciences in Saint Petersburg he travelled to conduct ethnographic studies of his country, collecting his results in the article Bidrag till Finlands kännedom i etnografiskt hänseende ("Contributions to the knowledge of Finland with respect to ethnography"), published on the Suomi journal.
In this work he drew the boundary between the regions populated by the Tavastian and Karelian tribes based, among other things, on a survey of the spoken dialects.
In 1847 he co-founded a Finnish newspaper, Suometar, of which he was editor in chief for the first six months.