Sosnovka (Russian: Сосновка; Yakut: Сосновка) is a rural locality (a selo), and one of two settlements in Vilyuysk Urban Okrug of Vilyuysky District in the Sakha Republic, Russia, in addition to Vilyuysk, the administrative center of the Urban Okrug and the district.

[1] This settlement's village hall is said to be the remains of a leper hospital inspired by the British explorer Kate Marsden who travelled the length of Russia to find a cure for leprosy she had been told about.

The heir apparent is now said to be a herb called kutchutka which was mentioned in an 1899 Sakha dictionary.

One local herbalist told researchers in 2008 that it was so rare that he had not seen it recently.

The village hall carries a plaque recording the centenary of Marsden's visit.