Predrag Cvitanović (pronounced [tsʋitǎːnoʋitɕ, - tsʋǐta-]; born April 1, 1946) is a theoretical physicist regarded for his work in nonlinear dynamics, particularly his contributions to periodic orbit theory.

Cvitanović is a member of the Royal Danish Academy of Sciences and Letters, a corresponding member of Croatian Academy of Sciences and Arts, a recipient of the Research Prize of the Danish Physical Society, and a fellow of the American Physical Society.

[1] In 2009 Cvitanović was the recipient of the prestigious Alexander von Humboldt Prize for his work in turbulence theory.

[1] Perhaps his best-known work is his introduction of cycle expansions— that is, expansions based on using periodic orbit theory—to approximate chaotic dynamics in a controlled perturbative way.

This technique has proven to be widely useful for diagnosing and quantifying chaotic dynamics in problems ranging from atomic physics to neurophysiology.