Corneriella is a genus of fungi in the family Tricholomataceae. The genus contains two species known from the United States and Thailand, and at least four others have been detected by DNA sequencing. Corneriella was described the mycologist Marisol Sánchez-García in 2014 with Corneriella bambusarum as the type species. Macroscopically, it resembles Tricholoma. Phylogenetically, it is closely related to Dennisiomyces and Albomagister.