Trzciniec Mały [ˈtʂt͡ɕiɲɛt͡s ˈmawɨ] is a village in the administrative district of Gmina Kosów Lacki, within Sokołów County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) south of Kosów Lacki, 21 km (13 mi) north of Sokołów Podlaski, and 89 km (55 mi) north-east of Warsaw.