Genovefa Piotrowski, 55, the owner and operator with her husband of the Plaza Bakery and Caterers in Arlington since 1962, died of cancer Feb. 27 at Arlington Hospital.

Mrs. Piotrowski, who lived in Arlington, was born in Imianpo, Manchuria, China. She grew up in Tientsin, China. From 1945 to 1947, she worked for a U.S. Navy hospital there and then taught in St. Joseph's School. She was an employe of the British consulate in Tientsin until 1953, when she left China and moved to Rio de Janeiro.

She worked for the Intergovernmental Committee for European Immigration there until 1959, when she moved to this country. She settled in the Washington area and worked for the Embassy of Pakistan until she and her husband founded the Plaza Bakery and Caterers.

Mrs. Piotrowski was a member of St. Ann's Catholic Church in Arlington and Our Lady Queen of Poland in Silver Spring.

Survivors include her husband, Zenon S. Piotrowski, of Arlington; five daughters, Helen S. Syska of Sterling, Va., Elizabeth K. Miska of Beltsville, Sophia M. Piotrowski and Christine A. Piotrowski, both of Fairfax, and Regina L. Piotrowski of Arlington; six sisters, Czeslawa Stempniak of Arlington, Helen Poniatowski of Hackettstown, N.J., Elizabeth Ozdzenska of Warsaw, Poland, Kazia Stepp and Adela Pittarelli, both of San Jose, Calif., and Sophia Wils of Holland; and four grandchildren.