Featherweight Charm

This charm is used to make something lightweight so that it can be carried more easily.

Ferula

Conjures a splint and bandages.

Fidelius Charm

“Fidelis�?is Latin for “faithful friends�? This is a complex charm that allows someone or something to be hidden away, often times in plain sight, for an indefinite period of time. The location of the hidden people or items is a secret known only to one person, the Secret-Keeper, and the information is stored within their very soul. The Secret-Keeper is the only one with the power to divulge the secret. The information remains undisclosed until said time when the Secret-Keeper decides to reveal it; not even those who have been told the secret information can reveal what they know. However, the Secret-Keeper does not have to directly speak with someone to tell him or her the secret, the information can be disclosed in a letter as long as the Secret-Keeper is the one who wrote it.

Finite

From the Latin “finis,�?meaning “end.�?Similarly to Finite Incantatem, this removes spell effects. It may be that Finite stops a single spell whilst Finite Incantatem stops all current spells. Remus Lupin cast this spell on Neville Longbottom in the Department of Mysteries to remove the effects of a Tarantallegra curse.

Finite Incantatem

From the Latin "finis," meaning "end." Removes the effects of any spells currently cast.

Fire Charm

When Harry and Dumbledore were attacked by Inferi in the Horcrux cave, Dumbledore created a ring of crimson and gold fire to protect them. This may be simple a Dumbledore-powered version of Flagrate or Incendio, or it may be a separate fire creation charm.

Flagrate

“Flagrantia�?is Latin for “burning�? Makes the spell-caster able to draw lines of fire with their wand.

Flame Freezing Charm

Charm used by Medieval witches to remove the effects of the fire when they were burned at the stake. It is a good idea at this point to scream a bit and pretend to be burning.

Flying Charm

Different to Wingardium Leviosa, which merely makes objects float in the air, the Flying Charm allows them to be maneuvered by the user and turns them into genuinely controllable flying items. The Flying Charm is used on broomsticks (as confirmed by Draco Malfoy when he was criticising Ron's broom in 1995 - "why would anyone put a Flying Charm on a mouldy old log like that?" being the words he chose), and also presumably Flying Carpets. It is clear that Flying Charms can be cast only on objects rather than animals or people, as it is well known that no spell yet exists that allows a wizard to fly unaided.

Freezing Charm

Used by Hermione to immobilise Cornish Pixies in Professor Lockhart's first Defence Against the Dark Arts lesson, following Lockhart's pathetic attempt to deal with them himself. Freezing Charms are also effective in disabling Muggle burglar alarms.

Fur Charm

When Ginny was upset about the spate of Petrifications at school during her first year, Fred and George embarked on an ill-conceived campaign to cheer her up. One thing that they did was to cover themselves in fur and jump out at her from behind statues. Far from cheering her up, however, it merely caused her to have nightmares.

Furnunculus

Makes the victim's body break out in boils. When used in conjunction with the Jelly-Legs Jinx it causes tentacles to sprout all over the victim's face.

Gripping Charm

Allows a person to grip an object more effectively. This was invented in 1875 and is primarily used in Quidditch to allow the Chasers to handle the Quaffle one-handed whilst still keeping a grip on their brooms.

Growth Charm

Similar to the Enlargement Charm and the Engorgement Charm, this spell causes the target to increase in size. The precise differences between these three enchantments are unknown. Harry got confused during his Charms OWL and cast a Growth Charm on a rat he was meant to be turning orange. It had grown to the size of a badger before he could stop it.

Hair Growth Jinx

A spell cast on Alicia Spinnet by Miles Bletchley before the Gryffindor vs Slytherin Quidditch match in 1995. It caused her eyebrows to grow so fast they obscured her vision.

Hair Loss Curse

Makes the victim lose their hair. Covered by Professor Vindictus Viridian in his book on curses and counter-curses.

Hair-Thickening Charm

Causes hair to thicken. During the build-up to the Gryffindor vs Slytherin Quidditch match in 1995, Alicia Spinnet was hit from behind by a curse from Miles Bletchley that caused her eyebrows to grow so fast they obscured her vision. Professor Snape refused to believe this and stated that she must have attempted a Hair-Thickening Charm on herself.

Hex Deflection

It is unclear whether this is a spell or a branch of magic (such as Occlumency). Either way, it is used to block or deflect magic cast as you.

Hives Hex

Causes the victims face to erupt in hives. Hives are raised lumps on the skin, usually caused by an allergic reaction.

Homorphus Charm

From "Homo" meaning "man" and "morphus" meaning "transform". Used to force a werewolf to revert to human form. Lockhart claimed to have used this against the Wagga Wagga Werewolf. He didn't, of course, but it is likely that it is a real spell.

Horcrux Creation Spell

After committing the act of murder, the Horcrux Creation Spell is used to encase the torn portion of the killer's soul into an object or creature. This is exceptionally advanced and evil magic, and even Horace Slughorn did not know any details at all of this spell when the young Tom Riddle asked him about it.

Horn Tongue Hex

Turns the tongue to horn. Harry found this hex in a book when he was trying to work out how to defeat a dragon in the first task of the Triwizard Tournament. He decided not to use it as it would just give the dragon an extra weapon.

Horton-Keitch Braking Charm

Patented by Basil Horton and Randolph Keitch, this charm aids broomsticks in slowing down in a controlled manner. It is used on broomsticks made by the Comet company.

Hot Air Charm

Causes hot air to stream out of the end of the caster's wand. This is similar to Relashio, but in the case of the Hot Air Charm, no sparks are released. A complicated wand movement is required to cast this spell but no incantation. Hermione used it to dry her robes in winter 1995, and also to create a path through the snow.

Hover Charm

Makes an item hover in the air. Famously used by Dobby on Aunt Petunia’s pudding.

Hurling Hex

Professor Flitwick thought that Harry's new Firebolt broomstick - a gift from Sirius Black - might be jinxed with this hex. It is likely that it causes the rider to be thrown off the broomstick.

Immobulus

"Immobilise" means to prevent moving.  Stops an object moving. The name of this spell comes from the films rather than the books but is included here as it is very likely to be the "clever Freezing Charm" used by Hermione to immobilise Cornish Pixies in Professor Lockhart's first Defence Against the Dark Arts lesson. See also "Freezing Charm".

Impedimenta

“Impedimentum�?is Latin for “a hindrance�? Use to stop or slow down a person or creature (as opposed to an object).

Imperio

From the Latin "impero," meaning "to give orders, rule, hold sway," or "imperium," meaning "power to command, rule, control." The Imperius Curse. This is used to control the actions of another person, leaving that person at the mercy of the spell caster. The experience of being under the curse is described as a fantastic sense of release, until the victim starts to fight back. The curse can be fought and its hold broken, but many witches and wizards are unable to do so. Because of its very dangerous implications, the Imperius Curse is one of the three Unforgivable Curses. Use of this curse against another human being is punishable by a life sentence in Azkaban.

Imperturbable Charm

Impeturbable means “not able to be disturbed�? Creates a barrier which sounds, objects and people cannot cross.

Impervius

Impervious means “incapable of being affected�? Used to make an object resistant to water.

Incantation Free Magic

Whilst the vast majority of spells have a notional verbal component, any spell can in fact be cast without speaking by a sufficiently talented wizard. It appears that it is the power of the mind and the body which causes the spell to take effect, and the incantation is merely a vehicle used to help create the necessary mental and physical conditions for the magic to be successful. The more advanced the magic, the more difficult it is to cast without its verbal component, and even Voldemort can be found using the incantation for spells such as Avada Kedavra. Non-verbal magic is taught in the sixth year and above at Hogwarts.

Incarcerous

“Incarcerate�?means to shut in. Summons ropes which then bind the victim.

Incendio

“Incendo�?is Latin for “set fire to�? Creates fire.

Intruder Charm

The wizarding equivalent of a burglar alarm. It makes an audible signal when the area covered by the charm is entered by somebody or something.

Invisibility Spell

Fred and George Weasley used this spell to good effect in their range of Headless Hats. Hermione was particularly impressed that they’d managed to make the range of invisibility go beyond the charmed object. This spell is different to Evanesco in that Evanesco actually causes the item to cease to exist rather than simply making it invisible.

Inanimatus Conjurus

From the Latin “inanimus�? meaning “inanimate�? and the word “conjurus�? a derivative of “conjure�?  A spell mentioned in passing as homework in Harry’s fifth year. The effect is unknown, but presumably involves conjuring inanimate objects. Professor McGonagall said at another point that Conjuring Spells were NEWT level magic, and so this is probably a simplified version.

Instant Scalping Hex

Removes the hair from the victim �?instantly. Harry consulted the book "Basic Hexes for the Busy and Vexed" in preparation for the Triwizard tournament and found this spell but discarded it due to the fact that dragons have no hair.