Duffy's Peak is a small hill or butte near the Salt Fork Brazos River in Garza County, Texas.

Duffy's Peak extends less than 50 ft (15 m) above the river, yet despite its small size, it served as an important landmark for early surveyors of the region and is said to be named for a member of the original survey team who died and was buried nearby in the late 1870s.

[1] Duffy's Peak is located in the rolling plains to the south and east of the Caprock Escarpment of the Llano Estacado.

The soils of the area are moderately deep silt loams that support mesquite, yucca, cacti, and grasses.

The erosionally resistant sandstones of the peak's cap have protected underlying soils that have remained intact, while surrounding sediments have eroded away.