Gracilineustes is an extinct genus of marine crocodyliform that lived in the oceans during the Middle to Late Jurassic.

Gracilineustes was a carnivore that spent much, if not all, its life out at sea.

It was a small reptile, with G. leedsi measuring 2.25–3.11 m (7.4–10.2 ft) long and G. acutus measuring 3.77 m (12.4 ft) long.

[3] Fossil specimens referrable to Gracilineustes are known from Middle-Late Jurassic deposits of England and France.

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