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| Name | Type | Slot | Bonuses | Effects | Requirements |
| M'Amulet Mold | | | | | |
| Machete | | | | | |
| Magenta Key | | | | | |
| Magic Glue | | | | | |
| Magic Logs | | | | | |
| A Magic Scroll | | | | | |
| Magic Secateurs | Weapon | Primary | | | |
| Magic Shortbow | Weapon | | | Ranged Attack +69 | |
| Magic String | | | | | |
| Magic Whistle | | | | | |
| Magical Essence | | | | | |
| Mahogany Bench | | | | | |
| Manta Ray | Food | | | | |
| Maple Log | | | | | |
| Maple Longbow | | | | | |
| Marble Amulet | | | | | |
| Marigold Seed | | | | | |
| Marigolds | | | | | |
| Marrentil | | | | | |
| Masked Earmuffs | | | | | |
| Master Thieves Armband | | | | | |
| Meat Tenderizer | Weapon | Primary | Crush Attack +53, Magic Attack -4, Slash Attack -4, Stab Attack -4, Strength +48 | | |
| Medium Cog | | | | | |
| Metal Bar | | | | | |
| Metal Sheet | | | | | |
| Mime Gloves | Armor | Hands | | | |
| Mime Legs | Armor | | | | |
| Mime Mask | Armor | Head | | | |
| Mime Shirt | Armor | Body | | | |
| Mind Rune | | | | | |
| Mining Prop | | | | | |
| Miscellaneous Key | | | | | |
| Mithril 2-Handed Sword | Weapon | Primary | | | |
| Mithril Arrow | Weapon | Ammo | | | |
| Mithril Axe | Weapon | Primary | Crush Attack +10, Slash Attack +12, Slash Defense +1, Stab Attack -2, Strength +13 | | |
| Mithril Bar | | | | | |
| Mithril Boots | Armor | Feet | Crush Defense +10, Magic Attack -3, Ranged Attack -1, Slash Defense +9, Stab Defense +8 | | |
| Mithril Chainbody | Armor | Body | | | |
| Mithril Claws | Weapon | Primary | | | |
| Mithril Dagger | Weapon | Primary | | | |
| Mithril Full Helmet | Armor | Head | | | |
| Mithril Halberd | Weapon | Primary | Crush Defense +4, Magic Attack -4, Slash Attack +28, Slash Defense +2, Stab Attack +22, Stab Deffense -1, Strength +29 | | |
| Mithril Kiteshield | Armor | Secondary | | | |
| Mithril Longsword | Weapon | Primary | | | |
| Mithril Mace | Weapon | Primary | | | |
| Mithril Medium Helmet | Armor | Secondary | | | |
| Mithril Ore | | | | | |
| Mithril Plate Legs | Armor | Legs | | | |
| Mithril Plate Skirt | Armor | Legs | | | |
| Mithril Platemail Body | Armor | Body | | | |
| Mithril Scimitar | Weapon | Primary | | | |
| Mithril Scimitar | Weapon | Primary | | | |
| Mithril Spear | Weapon | Primary | | | |
| Mithril Square Shield | Armor | Secondary | Crush Defense +15, Magic Attack -6, Ranged Attack -2, Ranged Defense +17, Slash Defense +19, Stab Defense +17 | | |
| Mole Claw | | | | | |
| Mole Skin | | | | | |
| Molten Glass | | | | | |
| Monk's Robe (Bottom) | Armor | Legs | Prayer +5 | | |
| Monk's Robe (Top) | Armor | Legs | Prayer +6 | | |
| Monkey | | | | | |
| Monkey Amulet Mold | | | | | |
| Monkey Bar | Food | | | | |
| Monkey Bones | | | | | |
| Monkey Corpse | | | | | |
| Monkey Dentures | | | | | |
| Monkey Gregree | | | | | |
| Monkey Skin | | | | | |
| Monkfish | | | | | |
| Moonlight Mead | Drink | | | Heal (4 hit points) | |
| Mouse Toy | | | | | |
| Moving-Over-Distance Sphere | | | | | |
| Mud | | | | | |
| Mud Rune | | | | | |
| Muddy Key | | | | | |
| Mudskipper Hat | Armor | Head | | | |
| Mystery Box | | Head | | | |
| Mystic Boots | Armor | Feet | Magic Attack +3, Magic Defense +3 | | Defense: 20, Magic: 40 |
| Mystic Hat | Armor | Head | Magic Attack +4, Magic Defense +4 | | Defense: 20, Magic: 40 |
| Mystic Mud Staff | Weapon | Primary | Crush Attack +10, Crush Defense +1, Slash Attack -1, Slash Defense +3, Stab Attack +10, Stab Defense +2, Strength +50 | Grants Unlimited Earth and Water Runes While Wielded | Attack: 40 |
| Mystic Robe (Bottom) | Armor | Legs | Magic Attack +15, Magic Defense +15 | | Defense: 20, Magic: 40 |
| Mystic Robe (Top) | Armor | Legs | Magic Attack +20, Magic Defense +20 | | Defense: 20, Magic: 40 |
| Mystical Robes | Armor | Body | | | Defense: 20, Magic: 40 |
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