Tegula patagonica is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.

 The size of the shell varies between 10 mm and 21 mm. The thick, umbilicate shell has an orbiculate-conical shape. It is transversely narrowly granulose-sulcate. It has a uniform brownish or purplish color. The spire is conic. The apex is obtuse. The five whorls are subcarinate with sutures excavated. The aperture is rounded. The columella is bidentate.

Distribution: This marine species occurs from Southern Brazil to Southern Chile at depths between 0 m and 57 m.