Impedimenta (Impediment Jinx, Impediment Curse): This powerful spell is capable of tripping, freezing, binding, knocking back and generally impending the target's progress towards the caster.
Imperio (Imperious Curse): causes the victim of the curse to obey the spoken/unspoken commands of the caster.
(Imperturbable charm): makes objects such as doors impenetrable (by everything, including sounds and objects.
Impervius: this spell makes something repel (literally, become impervius to) substances and outside forces, including water.
Incarcerous: ties someone or something up with ropes.
Incendio: produces fire.
(Intruder Charm): detects intruders and sounds an alarm.
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Book of spells A to Z
Fantasythis book is for potterheads who want to learn all the spells!