Helene Batjer, 55, American consul general in Istanbul, died of cancer Sunday at Georgetown University Hospital.

Miss Batjer had served in numerous foreign capitals since she joined the State Department in 1945. She commended on several occasions for her work in helping to restore calm and relay accurate information during crises.

A month after she assumed her post in Turkey last July Palestinian terrorists raided the airport at Istanbul killing four persons, including Harold Rosenthal, an assistant to Sen. Jacob K. Javits (R-N.Y.)

Miss Batjer's work during that includent in consoling the wounded, comforting stranded passengers and sending reports to the State Department, prompted a "profusion of letters" praising and thanking her according to a State Department official.

Miss Batjer was born in Shoshone, Idaho and earned a bachelor's degree in 1944 at the University of Nevada.

From 1945 to 1955, she was assigned to U.S. missions and embassies in Sofia, Rome, Athens and Berlin. She was an intelligence research analyst at the State Department from 1955 to 1957, then spent a year studying the Serbo-Croatian language at the Foreign Service Institute here.

After that Miss Batjer seved in Belgrade, Stockholm, Zagreb, and Rawalpindi, Pakistan. Her overseas service was interruted for three years, from 1967 to 1970, when she was Czechoslovakian desk officer at the State Department, and in 1972 and 1973 when she attended a senior seminar for high level officers in Washington.

She is survived by a brother Cameron H. Batjer chief justice of Nevada Supreme Court, of Carson City Nev., and a sister Grace Williams, of California.