Geranium caespitosum, the purple cluster geranium or pineywoods geranium, is a perennial herb native to the western United States and northern Mexico. Its US distribution includes Arizona, Colorado, Nevada, New Mexico, Texas, Utah, and Wyoming.

It has a purple to red flower with 5 stamens, and the sepals are acuminate, tapering with a long point. It has palmately lobed leaves. The fruit is a schizocarp made up of 5 mericarps. Flowers bloom May to September. Geranium caespitosum has fleshy roots that penetrate deeply into the soil. It grows in damp soils, as in the understory of coniferous forests and in canyons.

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