Oscar Levine, 69, an insurance broker who had played violin with the National Symphony and numerous other orchestras here, died of cancer Monday at Suburban Hospital. He lived in Silver Spring.

Mr. Levine was a charter member of the National Smyphony Orchestra at the age of 19 and played with the orchestra during the 1930s. Over the years, he also had played with the Capitol Theater Orchestra, the Redskins Band, the Shoreham Hotel's Singing Strings and the Bob Cross Orchestra.

While in his early 40s, Mr. Levine began a second career as an insurance broker, working from his home as a representative of a number of national firms. They included the Franklin Life Insurance Co., which elected him to its Million Dollar Club in 1970.

Mr. Levine was born in New York City and came to Washington as a child. He was a graduate of McKinley Technical High School. He studied the violin with several teachers in Washington, Baltimore, New York and Philadelphia. At the age of 16, he won a five-state contest sponsored by the National Federation of Music Clubs.

He was a member of the Musicians Union here and the Samuel Gompers Lodge of the Masons.

Survivors include his wife, Mitzi, of Silver Spring; three children, Sam, of Columbia, Md., Jerry, of Bridgton, Maine, and Berna Goldberg of Silver Spring, and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the AMC Cancer Research Center and Hospital in Denver, in care of Mrs. Allan S. Freedman, 15025 Emory Lane, Rockville, Md. 20906.