Levon Berzdikian, 78, a retired Washington restaurant owner who came to this city as a refugee from Turkey, died Monday at Sibley Memorial Hospital after a heart attack.

As an Armenian, Mr. Berzdikian was a member of one of the minorities being suppressed by the Turkish government in the name of nationalism.

He came to this country in 1921, and settled in Washington about a year later. He got a job as a bus boy at the Williard Hotel, and later was promoted to cake decorator and then pastry chef.

In February 1927, Mr. Berzdikian travelled to Greece to visit a family that also who fled his native city of Albistan, Turkey. There he married Ashgen, whom he had known as a child, and they returned to Washington.

Mr. Berzdikian opened a restaurant near the Botanical Garden on Capitol Hill, where he specialized in home-style meals. He moved to M Street in Georgetown where he opened People's Delicatessen. He retired in 1958.

Over the years, he and his wife helped pay the passage for both their mothers to come to the United States. They located another relative in a German prisoner of war camp following World War II, and helped pay his way to South America and finally to the United States.

Following his retirement from business, Mr. Berzdikian devoted most of his time to his garden and backgammon playing.

In addition to his wife, of the home in Washington, he is survived by three daughters, Annahid Kazarosian, of Boston, Zabel Kojoyian, of Newton, Mass., and Ardemis Kocharian of McLean, a son, Levon Jr. of Columbia, Md.; three sisters in Turkey and six grandchildren. CAPTION: Picture, LEVON BEZDIKIAN