Gmina Somianka is a rural gmina (administrative district) in Wyszków County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Somianka, which lies approximately west of Wyszków and north-east of Warsaw.
The gmina covers an area of , and as of 2006 its total population is 5,491 (5,591 in 2013).
Gmina Somianka contains the villages and settlements of:
Gmina Somianka is bordered by the gminas of Dàbrówka, Rzàà Ânik, Serock, Wyszków and Zatory.
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