Defensive Spells:
* Protego: A shield charm that deflects jinxes and hexes.
* Protego Totalum: A stronger version of Protego, creating an impenetrable shield.
* Stupefy: A stunning spell that renders the target unconscious.
* Imperio: A powerful control spell that forces a person to obey the caster.
* Expelliarmus: A disarming spell that forces the target to drop whatever they are holding.
* Reparo: A repair spell that can mend broken objects.
* Lumos: A spell that illuminates the tip of the wand with a light.
* Nox: Extinguishes the light produced by Lumos.
* Accio: A summoning charm that brings an object to the caster.
* Alohomora: A spell that unlocks doors and other locks.
* Petrificus Totalus: A spell that freezes the target, rendering them immobile.
* Finite Incantatem: A spell that counters most other spells.
Offensive Spells:
* Crucio: A torture spell that inflicts excruciating pain.
* Avada Kedavra: The Killing Curse, which instantly kills the target.
* Sectumsempra: A powerful curse that inflicts deep, bleeding wounds.
* Diffindo: A spell that cuts objects cleanly.
* Severing Charm: A spell used to cut things.
* Confundo: A spell that causes confusion.
* Legilimens: A spell that allows the caster to penetrate the target's mind.
* Obliviate: A spell that erases memories.
Other Spells:
* Expecto Patronum: A spell that creates a Patronus, a silver, animal-shaped guardian against Dementors.
* Wingardium Leviosa: A spell that levitates objects.
* Rictusempra: A tickling spell that can render the target helpless with laughter.
* Aguamenti: A spell that produces water.
* Evanesco: A spell that makes objects disappear.
* Episkey: A spell that heals minor injuries.
* Incendio: A spell that starts a fire.
* Flipendo: A spell that knocks back objects or people.
* Locomotor Mortis: A spell that immobilizes the target's legs.
Potions and Other Magical Items:
* Elixir of Life: A potion that extends life.
* Wolfsbane Potion: A potion that controls the effects of lycanthropy.
* Time-Turner: A device that allows the user to travel back in time.
* The Marauder's Map: A magical map that shows the location of every person and every place in Hogwarts.
This list includes only some of the spells used in the book. There are many other spells mentioned briefly, but without a specific incantation. This list also doesn't include spells used by the Dementors or other creatures.
For a complete list of all spells used in the Harry Potter series, you can check out online resources like the Harry Potter Wiki.