科梅西纽（葡萄牙语：Comercinho）是巴西米纳斯吉拉斯州的一个市镇。总面积656.563平方公里，总人口8720人，人口密度13.3人/平方公里。

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Comercinho is a municipality in the northeast of the Brazilian state of Minas Gerais. Its population in 2007 was 8,720 inhabitants in a total area of 657 km².

Comercinho belongs to the Pedra Azul statistical microregion. The elevation of the municipal seat is 614 meters. It became a municipality in 1942. This municipality is located to the southeast of Salinas on a dirt road that connects Santa Cruz de Salinas to Itinga. The closest population center with a hospital and banking facilities is Medina, a distance of about 36 km.