Saint-Martin-du-Tertre (French pronunciation: [sɛ̃ maʁtɛ̃ dy tɛʁtʁ] ⓘ) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France.

It is situated on the left bank of the river Yonne, 2 km northwest of Sens.

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