John W. Wright, 49, a scientist at the Naval Research Laboratory, and his 18-year-old daughter, Marion, were killed Monday in an auto accident near Baltimore. Dr. Wright was driving his daughter home to Accokeek for the Thanksgiving Day holiday from Franklin and Marshall College in Lancaster, Pa., where she was a student.

Maryland State Police said that the car crossed several lanes of traffic on the Baltimore Beltway, went through a guardrail and struck a utility pole.

Dr. Wright was head of the wave dynamics section at the Naval research lab. He had worked on radar camouflage and magnetic materials, and was an authority on the physics of ocean waves. He had joined the laboratory in 1956.

He had earned bachelor's and doctoral degrees in physics at Massachusetts Institute of Technology.

Dr. Wright was a member of the Union Radio Scneitifique Internationale and the American Geophysical Union. He was a 1976 recipient of the Navy's Meritorious Civilian Service Award.

Miss Wright was a native of Washington. A 1978 graduate of Gwynn Park High School in Prince George's County, she had been on the yearbook staff and had belonged to the National Honor Society.

She was a freshman at Franklin and Marshall, where she was majoring in English and French and was a member of the swimming team.

Survivors include Frances Ashby Wright, wife and mother, and Fred A., son and brother, both of the home, and Margaret Ahrens Wright, mother and grandmother, of Paterson, N.J.

The family suggests that expressions of sympathy be in the form of contributions to Davies Memorial Unitarian Church in Camp Springs or Franklin and Marshall College.