Dr. Stanley J. Kirchenbauer, 43, a specialist in obstetrics and gynecology and a former major in the Army Medical Corps, died Thursday at Montgomery General Hospital in Olney of acute myocardial disease.

Dr. Kirchenbauer, who lived in Rockville, was a member of the staff at Montgomery General Hospital and a former chief of staff of the hospital's department of obstetrics and gynecology. He had maintained a private medical practice in Olney since 1970.

He entered the Army Medical Corps in 1964, after earning a medical degree from the University of Maryland. He served as a resident physician in obstetrics and gynecology at the Presidio in San Francisco and later was stationed at Fort Sam Houston, Tex. He was chief of obstetrics and gynecology at Fort Belvoir when he left military service in 1970.

Dr. Kirchenbauer was awarded the National Defense Service Medal.

He was born in Baltimore and graduated from the University of Miami. He was a member of the Alpha Omega Alpha medical honor society and the American College of Obstetrics and Gynecology.

Survivors include his wife, the former DeAnne Reynolds, and two daughters, Tracey and Robin, of Rockville; his parents, Stanley H. and Anna Kirchenbauer of Glen Burnie, and a sister, Diane Kirchenbauer-Cox of Silver Spring.

The family suggests that expressions of sympathy be in the form of contributions to the Dr. Stanley Kirchenbauer Memorial Fund, in care of the Rev. Henry Postel, Chaplain, Montgomery General Hospital in Olney.