Eustheniidae is a family of insects in the order Plecoptera, the stoneflies. They are native to Australia, New Zealand, and Chile.

The nymphs live in lakes and in swift-flowing rivers and streams, where they cling to rocks. They are carnivorous. They take two to three years to develop into adults.

Genera include:

• Cosmioperla McLellan, 1996
• Eusthenia Westwood, 1832
• Neuroperla Illies, 1960
• Neuroperlopsis Illies, 1960
• Stenoperla McLachlan, 1867
• Thaumatoperla Tillyard, 1921
• † Boreoperlidium Sinitshenkova, 2013
• † Stenoperlidium Tillyard, 1935

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