The most Powerful Wizards in the Harry Potter are discussed below: Albus Dumbledore. Lord Voldemort. Gellert Grindelwald.
Voldemort himself wasn't more powerful than Dumbledore, and his followers, including Bellatrix, definitely weren't. Don't get me wrong, she was dangerous, and committed horrible crimes, but she wasn't as strong as Albus. After all, she was ultimately defeated by Molly Weasley.
No wizard contemporary to Dumbledore of after his time, till date has been more powerful than him. However, the Great Merlin was the most powerful wizard of all time, equivalent to the God of the wizardkind. The 4 founders of Hogwarts are most likely to have been far more powerful than Dumbledore.
All seven novels show Snape to be a very powerful wizard and to have been outstanding while a student. He specialises in potion making and has talent and passion for the Dark Arts. Sirius claimed that Snape knew more hexes and curses as a first-year student at Hogwarts than most seventh-years knew.
Severus Snape might have pretended to serve Voldemort (while in fact, as we all know, working as a double agent for Dumbledore), but there's almost no question he was more powerful than the Dark Lord.
Both characters had their strengths, but the last Harry Potter movie proved Snape was the strongest Hogwarts professor.
Albus Percival Wulfric Brian Dumbledore was the only wizard Voldemort ever feared and the only one who could have defeated him in a duel. Albus Dumbledore is the most powerful wizard in the Harry Potter.
Documents in the wizarding world suggest that Merlin was one of the most powerful wizards in Harry Potter and human history in general. Merlin was a Slytherin at Hogwarts and demonstrated an amazing understanding of the magical arts. Some argue him to be the most powerful wizard of all time.
Albus Dumbledore is the most obvious person who can defeat Voldemort, and the Dark Lord seemed to realize it. Rowling herself has explicitly stated in the books that Dumbledore is the only person Voldemort fears and recognizes as a genuine threat to his own power.
Hagrid was born to a wizard father and a giant mother, making him a half-giant. As a half-giant, Hagrid possessed great physical strength and endurance, including a resilience against some spells, though his ability to withstand spells was not as great as that of full giants.
During his final confrontation with Voldemort, Harry knew that he (Harry) was the Elder Wand's true master. He again cast Expelliarmus, ejecting the wand from Voldemort's hand into his own as the Killing Curse rebounded off his body, fatally striking Voldemort.
The Elder Wand, the most powerful wand ever created, is one of three objects that make up the Deathly Hallows, including the Cloak of Invisibility and the Resurrection Stone. The Elder Wand was 15 inches long, formed by Death himself, made of elder wood, and contained the center of the tail-hair of Thestral.
At some point in the tenth century, four of the greatest witches and wizards that ever lived founded Hogwarts School of Witchcraft and Wizardry. Their names were Godric Gryffindor, Rowena Ravenclaw, Helga Hufflepuff and Salazar Slytherin.
1 Lord Voldemort
Considered the most powerful dark wizard of all time, Voldemort was obsessed with his own half-blood ancestry and his search for power and immortality. To achieve the latter, he used his enemies' murders to fracture his soul into six and create his own set of Horcruxes.
Barry Wee Willie Winkle (b. 14 August, 1236) was the oldest known wizard in the 1990s, when he reached the age of 755. To celebrate the occasion, he held a massive party, inviting every wizard and witch he had ever known, a total of thirty million people. It was one of the biggest parties in wizarding history.
Lord Voldemort
Tom Marvolo Riddle started both Wizarding Wars, created the Death Eaters and killed Harry Potter's parents. We could go on – he was the most dangerous Dark wizard of all time – but we won't.
Tom Riddle/Voldemort
Professor Dumbledore once said that Tom Riddle, a.k.a. Lord Voldemort, a.k.a. "He Who Must Not Be Named" (Ralph Fiennes/Hero Fiennes Tiffin/Christian Coulson), was the most brilliant student that Hogwarts has ever known.
Dolores Umbridge's authority – especially her authority over children – is what makes her just so terrifying. In modern-day, she is more of a realistic threat to us Muggles than the Lord Voldemorts of the world.
Harry recognizes her as his year's best student and even said so at some point. But while Hermione can ace any test, she can't quite keep up with Harry on the battlefield. To her credit, Hermione is capable of advanced spells beyond her years, and she knows when and where to cast them.
Grindelwald Is More Powerful and Cunning Than Voldemort
Grindelwald had more power in the Wizarding World up till the final moments of his life. He had more followers, and they were intensely loyal to him. He conquered more of the globe and could perform more advanced forms of magic.
Winner: Snape
The kind of versatility in magical abilities that Snape displayed was almost around the level of Albus Dumbledore and Voldemort, making him easily more powerful than the average wizard and even the members of the Order of the Phoenix and the Death Eaters.
McGonagall then defeated Severus Snape and banished him from Hogwarts and began to defend the school.
When it comes to actual ability as a wizard, a case can certainly be made that Draco Malfoy is more talented than Harry. The only thing that Potter beats Draco at is his flying ability on a broomstick, but even then Draco pushes him all the way.