Katherine Augusta Westcott Tingley (1847, Newbury, Massachusetts - 1929) was a social worker and prominent Theosophist.

Tingley was a social worker in New York when she met William Quan Judge. She joined the Theosophical Society on October 13, 1894. After the Society split and after Judge's death she suceeded Judge as head of the Society that went with him. On February 13, 1900, she transferred the Society's international headquarters from New York City to Point Loma, California.

Tingley founded the Raja-Yoga School and Theosophical University in Point Loma.