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In mathematics, **Kazamaki's condition** gives a sufficient criterion ensuring that the Doléans-Dade exponential of a local martingale is a true martingale. This is particularly important if Girsanov's theorem is to be applied to perform a change of measure. Kazamaki's condition is more general than Novikov's condition.

Let be a continuous local martingale with respect to a right-continuous filtration . If is a uniformly integrable submartingale, then the Doléans-Dade exponential *Ɛ*(*M*) of M is a uniformly integrable martingale.

- Revuz, Daniel; Yor, Marc (1999).
*Continuous Martingales and Brownian motion*. New York: Springer-Verlag. ISBN 3-540-64325-7.