索莫蒂约是尼加拉瓜的城镇，位于该国西部，由奇南德加省负责管辖，始建于1873年，面积725平方公里，海拔高度36米，2005年人口29,030，人口密度每平方公里40.04人。

Somotillo is a municipality in the Chinandega department of Nicaragua.

According to the Instituto Nicaragüense de Estudios Territoriales (INETER), the municipality of Somotillo measures 724.71 km² and lies approximately 41 meters above sea level. Physiographically, most of the municipality lies north and east of the Nicaraguan Depression or Graben in the western foothills of the central cordillera of the country. The area drains into the Pacific, largely through the Estero Real. The town of Somotillo is located on the northern bank of the Rio Gallo, also known as the Rio Grande. A seasonal stream known as the Tecomapa runs north of the town.