Large-tooth flounders or sand flounders are a family, Paralichthyidae, of flounders. The family contains 14 genera with a total of about 110 species. They lie on the sea bed on their right side; both eyes are always on the left side of the head, while the Pleuronectidae usually (but not always) have their eyes on the right side of the head.

They are found in temperate and tropical waters of the Atlantic, Indian and Pacific Oceans. Several species are important commercial and game fishes, notably the California halibut, Paralichthys californicus.

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