Air Force Reserve Lt. Col. Lois J. Proctor, 45, a military and civilian employee of the Department of the Air Force and a Washington area resident since 1968, died Wednesday at Georgetown University Hospital. She had cancer.

Col. Proctor served on active duty with the Air Force for about 10 years. She was stationed in California, Florida and the Philippines until 1967, when she transferred to the Air Force Reserve. She was promoted to lieutenant colonel last year.

She was a civilian employee of the Air Force Ststems Command at Andrews Air Force Base and later transferred to Air Force headquarters, where whe was a program budget analyst.

Col. Proctor was an executive support officer with the 459th Military Airlift Wing at Andrews AFB and also was assigned to the public affairs office of the Air Force Systems Command there. She received a Meritorious Service Medal for her contributions.

She was born in Sioux City, Iowa, and reared in St. Paul, Minn. In 1957, she earned a bachelor's degree from the University of Minnesota.

A resident of Alexandria, Col. Proctor was active in Christ Church (Episcopal) there. She was a member of the church choir and often played the organ at church services. She was a member of the American Guild of Organists.

Survivors include her mother, Helen C., and a brother, Donald K., both of Bellevue, Wash., and a sister, Marian L. Brodden of Dulten of Duuth, Minn.

The family suggests that expressions of sympathy be in the form of contributions to the Georgetown University neurological research department.