Clerical Medical is sponsoring the Spitalfields Classical Music Festival in a three-year deal worth £150,000.
The life office has been associated with the event for 16 years. In 1983 it covered the administration costs and has sponsored a programme within the event for the last 6 years.
The main festival will take place in the three weeks between June 9 and June 30. The principal venue will be the Christ Church in the parish of Spitalfields in east London.
Clerical Medical chief executive Robert Walther says: "We are proud to be associated with the dynamism and musical excellence of the Spitalfields Festival. This represents a significant development in our well established tradition of sponsoring innovative music."