Just starting to read the series and the order is not so straight forward.
Apparently this is Asimov’s suggested order:
- The Complete Robot (1982) and/or I, Robot (1950)
- Caves of Steel (1954)
- The Naked Sun (1957)
- The Robots of Dawn (1983)
- Robots and Empire (1985)
- The Currents of Space (1952)
- The Stars, Like Dust (1951)
- Pebble in the Sky (1950)
- Prelude to Foundation (1988)
- Forward the Foundation (1993)
- Foundation (1951)
- Foundation and Empire (1952)
- Second Foundation (1953)
- Foundation’s Edge (1982)
- Foundation and Earth (1986)
There is one spoiler which may impact the attempt to read the series in this order, but I do not think that it will ruin your enjoyment of the series if you chose to read it this way. You will have gone through about 9-10 books before encountering it, and it really might be a good revelation at that point anyhow.
I originally read the books in publication order, but upon rereading I opt to read in chronological.
My suggestion is to read in chronological order. The pace and story telling also plays will in that order. It has a good cadence of story driven and character driven styles that makes the journey more palatable.