Gmina Tuczna is a rural gmina (administrative district) in Biała Podlaska County, Lublin Voivodeship, in eastern Poland. Its seat is the village of Tuczna, which lies approximately 28 kilometres (17 mi) south-east of Biała Podlaska and 93 km (58 mi) north-east of the regional capital Lublin.

The gmina covers an area of 170.37 square kilometres (65.8 sq mi), and as of 2006 its total population is 3,507 (3,246 in 2014).

Gmina Tuczna contains the villages and settlements of Bokinka Królewska, Bokinka Pańska, Choroszczynka, Dąbrowica Duża, Kalichowszczyzna, Leniuszki, Matiaszówka, Mazanówka, Międzyleś, Ogrodniki, Rozbitówka, Tuczna, Wiski, Władysławów, Wólka Zabłocka, Wólka Zabłocka-Kolonia and Żuki.

Gmina Tuczna is bordered by the gminas of Hanna, Kodeń, Łomazy, Piszczac, Sławatycze and Sosnówka.

• Polish official population figures 2006