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The Schizosaccharomycetes are a monotypic class in the kingdom of fungi. It contains the order Schizosaccharomycetales which is its only order, the fission yeasts. The genus Schizosaccharomyces is a broad and ancient clade within Ascomycota including five known fission yeast:

Schizosaccharomyces pombe, Schizosaccharomyces japonicius, Schizosaccharomyces octosporus, and Schizosaccharomyces cryophilus and Schizosaccharomyces osmophilus.