Marilyn P. Davis, 69, a magazine writer who worked as a government consultant on report writing and taught English at George Washington University, died Thursday at Sibley Memorial Hospital following a heart attack.

Mrs. Davis worked as a part-time instructor at George Washington University and the YWCA here from 1957 to 1964, before joining the General Services Administration as a consultant for two years. She later worked as an independent writing consultant.

She was the author of more than 60 articles that appeared in publications that ranged from women's magazines to Popular Mechanics.

Mrs. Davis was a native of Jackson, Ohio. She earned a bachelor's degree at Western Michigan University and a master's degree at Columbia University. She lived here from the mid-1940s to the early 1950s, then returned in 1957.

She was a member of Bethesda Presbyterian Church.

She is survived by her husband, Dr. Edwin W. Davis, of the home in Chevy Chase; a daughter, Lorraine Sorvino, of Tenafly, N.J.; two sons, Thomas G., of Tokyo, Japan, and Army Capt. Donald P., of San Diego, Calif., and six grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Bethesda Presbyterian Church Memorial Fund.