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Pisidium is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams.

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Pisidium amnicum is a species of very small freshwater clam, sometimes known as the greater European peaclam or the River pea shell. It is an aquatic bivalve in the family Sphaeriidae.

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Pisidium casertanum, the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae.

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Pisidium clessini is a species of extinct freshwater bivalve from family Sphaeriidae.

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Pisidium conventus, the arctic-alpine pea clam, is a species of freshwater bivalve from the family Sphaeriidae.

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Pisidium henslowanum is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae. It is commonly referred to as the Henslow peaclam.

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Pisidium hibernicum is a species of freshwater bivalve from the family Sphaeriidae.

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Pisidium lilljeborgii is a species of freshwater bivalve from the family Sphaeriidae.

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Pisidium milium is a species of very small freshwater bivalve in the family Sphaeriidae, the fingernail clams and pea clams.

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Pisidium nitidum, the shining pea clam, is a species of minute freshwater clam, an aquatic bivalve mollusc in the family Sphaeriidae, the pea clams and fingernail clams.

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Pisidium obtusale is a species of freshwater bivalve from family Sphaeriidae.

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Pisidium pseudosphaerium is a species of freshwater bivalve from family Sphaeriidae.

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Pisidium pulchellum, the iridescent pea mussel, is a minute species of pea clam, a freshwater bivalve in the family Sphaeriidae.

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Pisidium punctiferum, the striate peaclam, is a freshwater bivalve of the family Sphaeriidae.

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Pisidium subtruncatum is a species of pill clam, a minute freshwater bivalve in the family Sphaeriidae.