Porumbacu de Jos (; ) is a commune in Sibiu County, Transylvania, central Romania, first documented in 1473. It is composed of five villages: Colun (Kellen, Kolun), Porumbacu de Jos, Porumbacu de Sus (Felsőporumbák), Sărata (Salz, Szarata), and Scoreiu (Skorei).
The commune is located in the southeastern part of the country, at the extreme west of the historical region of Țara Făgărașului. It is crossed by the DN1 road, and lies at a distance of from the county seat, Sibiu, from Făgăraș, from Brașov, and from Bucharest.
At the 2011 census, Porumbacu de Jos had a population of 3,061; of those, 86.28% were Romanians and 8.3% Roma. At the 2021 census, the commune had a population of 2,876; of those, 75.87% were Romanians and 12.07% Roma.
Porumbacu de Jos is a base for hiking and climbing tours to the Southern Carpathians, notably the Negoiu chalet at altitude, which lies at the foot of Negoiu Peak ().
Natives (1905 – 1960) engineer, academic, and corresponding member of the Romanian Academy Ioan Alexandru Lapedatu (1844 – 1878) poet, prose writer, and newspaper contributor
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