- The Assassin’s Blade – A collection of prequel stories, including four novellas: The Assassin and the Pirate Lord, The Assassin and the Healer, The Assassin and the Desert, The Assassin and the Underworld, The Assassin and the Empire.
- Throne of Glass
- Crown of Midnight
- Heir of Fire
- Queen of Shadows
- Empire of Storms
- Tower of Dawn – Technically part of the main series, but follows Chaol rather than Aelin.
- Kingdom of Ash
RiverMoose-Reads 
My dad finished reading the series before I did (currently on queen of shadows) and he recommended reading in publication order because otherwise the prequel reveals too much about the coming stories
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That makes sense.
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