Leslie E. Jones, 68, chairman of the Latin Department at St. Stephen's Episcopal School for Boys and a former organist and choirmaster, died Thursday at Circle Terrace Hospital in Alexandria. He had a liver ailment.

Mr. Jones was born in Liverpool, England. He was educated at Oxford University, where he earned a bachelor's degree in music and a master's degree in the classics. In 1935, he left England to teach in Canada. In 1938, he moved to the United States and taught at St. George's School in Newport, R.I. He became a U.S. citizen in 1942.

During World War II, Mr. Jones served in the Army as a bandmaster and as an instructor in military administration.

After the year, he lived in Riverside, Conn., and pursued a career in business journalism and public relations in New York City. He was the organist and choirmaster at a number of Episcopal churches.

In 1960, Mr. Jones resumed his teaching career at the Trinity Pawling School in Pawling, N.Y. In 1965, he moved to Alexandria and joined the faculty of St. Stephen's. He taught Latin, French and music appreciation until he was hospitalized last month. For some years, he also was the organist and choirmaster at Emmanuel Episcopal Church in Alexandria.

His marriage to the former Janet Love Fraser ended in divorce.

Survivors include two sons, Evan, of Erie, Pa., and David, of New York City, and two brothers and a sister, all in England.

The family suggests that expressions of sympathy be in the form of contributions to the St. Stephen's School Chapel Memorial Fund, Alexandria.