The Temple of Castor and Pollux (Italian: Tempio dei Dioscuri) was an ancient temple in the Roman Forum, Rome, Central Italy. It was originally built in gratitude for victory at the Battle of Lake Regillus (495 BC). Castor and Pollux (Greek Polydeuces) were the Dioscuri, the "twins" of Gemini, the twin sons of Zeus (Jupiter) and Leda. Their cult came to Rome from Greece via Magna Graecia and the Greek culture of Southern Italy.

The Roman temple is one of a number of known Dioscuri temples remaining from antiquity.

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