The following list of known freshwater fish species, subspecies, and hybrids occurring in the U.S. state of Idaho is taken from Wydoski and Whitney (2003). Some scientific names have been updated or corrected. Asterisks denote introduced fishes. The list includes several anadromous species.

• Wydoski, Richard S.; Whitney, Richard R. (2003). Inland Fishes of Washington (2nd ed.). University of Washington Press. ISBN 978-0-295-98338-7.
• Idaho species of greatest conservation need

• FishBase
• Integrated Taxonomic Information System
• Idaho Comprehensive Wildlife Conservation Strategy Appendix F