George K. Valliotis, 79, a former businessman here who had been active in the Greek community, died of cancer Friday at Holy Cross Hospital.

He had served off and on for 30 years as a member of the board of trustees of Sts. Constantine and Helen Greek Orthodox Church. He was a charter member of D. C. Chapter of the order of Ahepa and a member of the Lanconian Society.

Mr. Valliotis was born in Sparta, Greece. He came to this country at the age of 12 and settled in Washington. Later he and a brother had several produce stores here.

In the early 1940s, he went into the restaurant business and operated a cafe in the old Empire hotel-apartment house at Ninth Street and New York Avenue NW. The building was partially destroyed in December 1947 when part of it collapsed, killing several persons.

Mr. Valliotis then became a sales manager for Versis Foods, which serviced the old Griffith Stadium and other clients. He left here in the mid-1960s to join a travel agency and ship servicing business in New York City. He returned here after retiring in 1971.

He is survived by his wife, Ellen, of the home in Silver Spring; two daughters, Kathryn George, of Maplewood, N.J., and Angela Monney, of Geneva, Switzerland; a brother, Stavros, of Greece, and two grandchildren.