Menas Diacopoulos, 86, a retired Washington restaurateur who was active in Greek cultural organizations, died of cancer Saturday at Arlington Hospital. He lived in Potomac.

Mr. Diacopoulos was born in Tripolis, Greece. He immigrated to Washington in 1921 and worked at a delicatessen for a year before opening the first of a series of Washington restaurants, Peoples, at the corner of 20th and L streets NW. He later owned and operated the Rose Coffee Shop, the District Restaurant, the Liberty Lunch and the Minute Lunch, from which he retired in 1962.

He was on the board of trustees for Sts. Constantine and Helen Greek Orthodox Church and later became a member of St. Sophia Greek Orthodox Cathedral, both in Washington.

Mr. Diacopoulos was a founder and former president of the Washington chapter of the Pan-American organization and a member for more than 50 years of Osiris Lodge No. 26 of the Masons and Chapter 236 of the American Hellenic Educational and Progressive Association.

Survivors include his wife, the former Helen Tsintolas, of Potomac; a daughter, Mary D. Georgatosos of Rockville, and two grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to St. Sophia Greek Orthodox Cathedral or Sts. Constantine and Helen Greek Orthodox Church.