Fluvioviridavis is an extinct genus of bird from the Early Eocene Green River Formation of Wyoming (United States) and London Clay Formation of the United Kingdom.

[3] There are three known species: F. platyrhamphus from the Green River and F. michaeldanielsi and F. nazensis from the London Clay.

Fluvioviridavis is the only genus currently named in the monotypic family Fluvioviridavidae.

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