Bestiary

A bestiary is a list of the monsters in an area or in this case a game. This bestiary is about the monsters in Old School RuneScape.

Below are links to bestiary lists organised by the monster's levels:
 * Levels 1 to 10
 * Levels 11 to 20
 * Levels 21 to 30
 * Levels 31 to 40
 * Levels 41 to 50
 * Levels 51 to 60
 * Levels 61 to 70
 * Levels 71 to 80
 * Levels 81 to 90
 * Levels 91 to 100
 * Levels higher than 100

Free-to-play has their own bestiary without pay-to-play monsters:
 * Free-to-play bestiary