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• The Lord of the Rings, if you haven’t read those yet
• The Midnight Thief duology by Livi Blackburne
• Nadine Brandes’ A Time to Die (the whole series, I’m assuming, but I’ve only read the first one)
• The Strange Case of Dr. Jekyll and Mr. Hyde is another classic with a strong theme
• I personally found the theme in The Picture of Dorian Grey interesting, but that’s definitely a darker story overall
• The Fire Rain Chronicles by Miranda Marie
• Synapse by Steven James (thank you, @daeus-lamb, for recommending that one!)
• Steward Stories by Beth Wangler is a collection of short stories that all have really good themes
• Hannah Heath’s Terebinth Tree Chronicles
• Fahrenheit 451 is another great classic
• Of Myth and Monster by The Phoenix Fiction Writers has stories with some great themes
• To Best the Boys by Mary Weber (which I promise is not as uber-feminist as it sounds)

And I second The Giver and The Wingfeather Saga. Both are excellent.