All the cyberpunk stuff by Willian Gibson.
"Angle Station" by Walter Jon Williams.
The entire Schismatrix collection by Bruce Sterling.
"Valis" by Philip K. Dick.
"The End of the Empire" by Alexis Gilliland.
The last recommendation isn't dystopian at first. In fact, it's a utopian view of the future, where most of Humanity transferred themselves as information into "polises" of fantastic computational capacity. Within these polises, iconic utopia exists. However, events in the real universe intrude and then some very dystopian things happen. Then, the book revolves around what can only be called "a galactic calamity". After that event was realized by the characters, their utopias shatter and the real dystopian phase starts.