Three persons, including an elderly couple, were killed yesterday in two automobile accidents in Montgomery County, police reported. Two other persons were critically injured in one of the smashups.

Police said Dorothy Goldstein, 69, was driving her husband Joseph, 70, to Holy Cross Hospital in Silver Spring, where he was to have been admitted for surgery, when they were in a collision shortly before 6 a.m. at Georgia Avenue and Forest Glen Road. The couple lived at 15300 Beaverbrook Ct. in Leisure World, a housing complex for the elderly.

Dorothy Goldstein was driving south on Georgia Avenue when she attempted a left turn onto Forest Glen Road toward the hospital, police said. They said the car collided with an auto driven by Juan Mota, 33, of Holmead Place in Northwest Washington.

Mota was treated at Suburban Hospital in Bethesda and released, and an unidentified passenger in his car was admitted in fair condition, a spokesman said.

All who were involved in the accident were wearing seat belts, police said. Investigation of the accident was continuing.

In the other fatal accident, an unidentified man was killed and two others were critically injured when their car, moving at "an excessively high rate of speed," hit a utility pole on Old Georgetown Road near Huntington Parkway in Bethesda about 3:30 a.m., police said.

The crash killed a front-seat passenger. The driver and a back-seat passenger were taken to Suburban Hospital several blocks away, where they were in critical condition, police and hospital spokesmen said.

The car's occupants, who were not carrying identification, were not wearing seat belts, police said. The accident was under investigation.