Louis Sergio "Lou" Antonelli (born January 6, 1957 in Medford, Massachusetts) is an American speculative fiction author who writes primarily alternate history, secret history, science fiction, and fantasy.
He resides in Clarksville, Texas.
Antonelli's stories have been published in print publications based in the United States, the United Kingdom, Australia, and Canada, as well as e-zines based in India and Portugal.