Scarlino is a comune (municipality) in the Province of Grosseto in the Italian region Tuscany, located about 100 km (62 mi) southwest of Florence and about 25 km (16 mi) northwest of Grosseto.

Scarlino borders the following municipalities: Castiglione della Pescaia, Follonica, Gavorrano, Massa Marittima.

Scarlino appeared before the year 1000 as a possession of the Aldobrandeschi family, and was later handed over to the bishops of Roselle and then the Alberti family. In the 13th century it was acquired again by the Aldobrandeschi, but later it passed to Pisa and then the Appiani of Piombino.

Scarlino remained part of the Principality of Piombino until the early 19th century, when it became part of the Grand Duchy of Tuscany. In 1834, Scarlino became a frazione of Gavorrano. In 1960, it regained its status as a municipality.

The municipality is formed by the municipal seat of Scarlino and the villages (frazioni) of Pian d'Alma, Puntone di Scarlino and Scarlino Scalo.

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