Lois Ada Wall, 85, a substitute school teacher in Montgomery County and a member of the Rockville Republican Women's Club, died of pneumonia Monday at Suburban Hospital in Bethesda.

Mrs. Wall was born in Pomeroy, Wash., and grew up in Zanesville, Ohio. She moved to Rockville in 1966 after teaching English and drama at the Andrews School for Girls in Willoughly, Ohio, for 40 years.

She was active in Republican Party affairs in Montgomery County and served as chaplain of the Rockville Republican Women's Club. She also was a volunteer who helped handle mail for presidents Nixon and Ford at the White House in addition to serving as a substitute English teacher in Montgomery County public schools. She was a member of the Daughters of the American Revolution.

Mrs. Wall was a graduate of Kent State University in Ohio and had studied at Western Reserve University, Ohio University, Wooster College, Montgomery College and Penn State, where she took a course from the poet Robert Frost.

Her husband, Marion Harold Wall, died in 1975.

Survivors include a son, Robert, of Rockville, a sister, Marie Webb, of Mentor, Ohio, and one grandson.

The family suggests that expressions of sympathy be in the form of contributions to the Rockville Christian Church, 301 Adclar Rd., Rockville, 20850.