Timeline by Michael Crichton
The Time Ships by Stephen Baxter (a sequel to H.G. Wells' Time Machine)
Harry Potter and The Prisoner of Azkaban
A Swiftly Tilting Planet by Madeleine L'Engle
A World Out of Time by Larry Niven
Lest Darkness Fal by L Sprague DeCamp (a history professor is swept back in time and has a chance to save the Roman Empire)
These aren't really SciFi:
Time and Again by Jack Finney
Somewhere in Time by Richard Matheson
The House on the Strand by Daphne du Maurier
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