The Ritito Conglomerate is a geologic formation in northern New Mexico dating to the Oligocene epoch.

[1] The formation is composed of orange-pink to reddish-brown arkosic conglomerate, sandstone, and siltstone with muscovite.

The clasts are 44% Proterozoic quartzite, with 25% granite, 13% metavolcanic rock, 10% quartz, 5% schist, and 3% gneiss, with traces of chert and Phanerozoic sandstone.

[4] The formation was named in 1958 by Fred Barker for exposures along Ritito Canyon, El Rito Creek (36°34′52″N 106°10′01″W / 36.581°N 106.167°W / 36.581; -106.167).

[5] Exposures further to the south were long described as the lower Abiquiu Formation, but Florian Maldonado and Shari Kelley reassigned these to the Ritito Conglomerate in 2009.