Tritenii de Jos (Hungarian: Alsódetrehem) is a commune in Cluj County, Transylvania, Romania.

It is composed of six villages: Clapa (Szentkirályi tanya), Colonia (Detrehemtelep), Pădurenii (Țigăreni until 1964, also formerly called Coc; Mezőkók), Tritenii de Jos, Tritenii de Sus (Felsődetrehem), and Tritenii-Hotar (Irisorai tanyák).

The commune is situated on the Transylvanian Plateau, at an altitude of 364 m (1,194 ft), on the banks of the river Valea Largă.

According to the census from 2002 there was a total population of 5,066 people living in this commune.

At the 2021 census, Tritenii de Jos had a population of 3,950, of which 87.92% were Romanians and 6.33% Hungarians.