Louise Wells Stroup, 75, a former editor at Time Inc. in New York and the widow of a former minister at Georgetown Presbyterian Church, died of pneumonia Tuesday at Arlington Hospital. She lived in McLean.

Mrs. Stroup was a native of Petersburg, Va. She earned her undergraduate degree in journalism at Columbia University. After graduation, she worked as a teacher in Georgia and as a book editor for Appleton & Co. in New York.

She joined Time Inc. in 1930 to work on its business magazine, Fortune. She later was an associate editor of Time magazine.

She left Time Inc. and moved to this area when she joined the Office of War Information during World War II.

From 1950 until 1970, her husband, the Rev. Russell C. Stroup, was minister of the Georgetown Presbyterian Church. During those years, Mrs. Stroup was involved in new ministries for young people and the elderly and the restoration of the church's historic buildings.

Mr. Stroup died in 1977. Their daughter, Susan, died in 1956.

Survivors include a sister, Marie Price, of McLean.

The family suggests that expressions of sympathy be in the form of contributions to the Georgetown Presbyterian Church, 3115 P St. NW, Washington, D.C. 20007, or to a charity of one's choice.