paladin181: Paladin's Quest
Actually, no; you play as a mage in that game (who just happens to be able to use a sword because main character).
Final Fantasy 4, on the other hand, might qualify, at least after a certain point in the game.
In Pathfinder: Wrath of the Righteous, it can be argued that your main character is a crusader of some sort, regardless of your path, mainly because the game is so focused on fighting a war against demons. Then again, some of the mythic paths might cast doubt on that issue (if you want to retain the crusader theme, I would go with Angel or Aeon).
Geralt_of_Rivia: But seriously, wouldn't most D&D games in which you can roll your character qualify since you should be able to play a Paladin in most of them?
Worth noting that Pool of Radiance would be an exception, as there's no paladin class in that game (though cleric is an option).
The Dark Sun games wouldn't work either, as there's no paladin (IIRC), and templar exists only as an NPC class.
I believe you can't currently play as a paladin in Baldur's Gate 3. (You can in Solasta, if you want to play something like the 5e paladin right now; no DLC required for this class.)