Ideciu de Jos (Hungarian: Alsóidecs, Hungarian pronunciation: [ˈɒlʃoːidɛtʃ]) is a commune in Mureș County, Transylvania, Romania. It is composed of three villages: Deleni (Oroszidecs), Ideciu de Jos, and Ideciu de Sus (Felsőidecs). The route of the Via Transilvanica long-distance trail passes through the villages of Ideciu de Sus and Deleni.

Historical population

Year	Pop.	±%
1850	2,018	—
1920	2,714	+34.5%
1941	3,005	+10.7%
1956	2,094	−30.3%
2002	2,005	−4.3%
2011	2,019	+0.7%
2021	1,998	−1.0%
Source: Census data

At the 2021 census, the commune had a population of 1,998, of which 86.29% were Romanians and 4.4% Hungarians.

• List of Hungarian exonyms (Mureș County)