Gilia austro-occidentalis is a species of flowering plant in the phlox family known by the common name southwestern gilia. It is endemic to the Central Coast Ranges of California, where it grows in local hill and valley habitat. It is a slender herb producing a very glandular stem sometimes laced with cobwebby fibers. The lobed leaves are located in a rosette around the base of the stem. The inflorescence is a cluster of flowers dotted with glands and webby hairs. The sepals are green to purple and ribbed with membrane between the ribs. The corolla is purple with a yellowish throat. It is a slender herb producing a very glandular stem sometimes laced with cobwebby fibers. The lobed leaves are located in a rosette around the base of the stem. The inflorescence is a cluster of flowers dotted with glands and webby hairs. The sepals are green to purple and ribbed with membrane between the ribs. The corolla is purple with a yellowish throat.