The new contract expires in 2008. Alsop has been principal conductor of the ensemble since 2002.
Alsop was recently named music director of the Baltimore Symphony Orchestra, a post she will take up in 2007. She is the first woman to lead a major British orchestra; among her acclaimed recordings with the Bournemouth ensemble are works by Bernstein, Weill, Bart‹k, Glass, and Adams.
Last month, Alsop won a $500,000 MacArthur "genius" grant.
"My work with the Bournemouth Symphony Orchestra includes some of my most rewarding musical experiences," Alsop said. "The players are not just exceptional musicians, but really great collaborators and people. . . Our future plans together are truly exciting and are geared to raise our artistic standards and achievements even higher."