There is some writing on the back that looks like it might be Russian. I tried to type the top sentence using an on-line translator keyboard and it looks something like this...
г. Пинск. Улица Т. Костіошко вид на костел св. Станислава. 30-е гг.
which translated as: Pinsk. Street T. Kostіoshko view of the Church of St.. Stanislaus. 30s.
This postcard is postmarked in 2014 from Belarus.
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Pinsk is a city in Belarus, in the Polesia region south-west of Minsk. The population is about 130,000.