There is no real spell that allows people to levitate objects. However, fans of the "Harry Potter" book series are familiar with the "Wingardium Leviosa" spell used by the characters to levitate and navigate objects while in the air.
Harry and his friends first learn Wingardium Leviosa in a class taught by Professor Flitwick. Hermione is the first student in class able to successfully levitate a feather in the first Potter book, "Harry Potter and the Sorcerer's Stone". Later in the book, Ron manages to successfully levitate a club over a troll's head when it secretly enters the school and traps Harry, Ron and Hermione in the bathroom. The club falls out of the air, clubbing the troll in the head and knocking it out.
The spell is also used in "Harry Potter and the Deathly Hallows" by Ron when he levitates a twig to press the knot on the Whomping Willow, allowing the trio to go to the Shrieking Shack. Harry uses it in the same book to levitate the side car of the motorcycle he and Hagrid are riding in when they detach from each other. Throughout the series, other students also use the spell to levitate various objects like foods and potions.