Foundation
Why it's similar
Foundation is the other towering pillar of political science fiction, and anyone who reads Dune eventually ends up here. Asimov and Herbert were working on opposite sides of the same question: can the future of civilization be predicted and controlled? Hari Seldon invents psychohistory, a mathematical science that forecasts the behavior of large populations, and uses it to shorten a coming dark age from thirty thousand years to one thousand. Herbert's Bene Gesserit breeding program operates on a similar premise, engineering a messiah across generations. Both authors treat history as something that can be engineered, then spend their novels showing how individual humans disrupt those plans.
Asimov's prose is drier and more utilitarian than Herbert's. He writes in scenes that read almost like transcripts of political debates, which works because the ideas are doing the heavy lifting. The book is structured as a series of crises spanning centuries, each one testing whether Seldon's plan holds. If you read Dune for the political maneuvering between Great Houses, Foundation gives you that same chess match on a galactic scale with a different set of pieces.