The San Miguel gneiss is a Paleoproterozoic pluton in the Nacimiento Mountains of New Mexico.

It ranges in color from salmon-pink to light pinkish-gray and in texture from fine- to coarse-grained.

[2] This range is underlain by numerous overlapping plutons emplaced in metasedimentary and metavolcanic beds that may correlate with the Vadito Group.

[3] The San Miguel gneiss itself may correlate with the Tres Piedras Orthogneiss in the Tusas Mountains.

[4] The gneiss was named by Woodward et al. in 1974 as part of their survey of Precambrian rocks in the southern Nacimiento Mountains.