 Kalphite Guardian | 67 | 1/5,461.33 |
 Kalphite Queen (Crawling) | 67 | 1/5,376 |
 Kalphite Soldier (Kalphite Lair) | 1–4 | 2/128 |
 Kalphite Worker | 4 | 2/128 |
 Killerwatt (Idle) | 8 | 11/140 |
| Killerwatt (Idle) | 37 | 1/140 |
 King Black Dragon | 67 | 1/682.67 |
 King kurask | 10 | 10/124, 3 rolls |
| King kurask | 15 | 7/124, 3 rolls |
| King kurask | 30 | 4/124, 3 rolls |
 Kraka | 16 | 5/128 |
 Kree'arra | 62–67 | 1/677.33 |
 Kurask (Normal) | 10 | 10/124 |
| Kurask (Normal) | 15 | 7/124 |
| Kurask (Normal) | 30 | 4/124 |
 Lava dragon | 67 | 1/1,820.44 |
 Liam (Normal) | 10 | 12/256 |
 Lizard | 5 | 4/128 |
 Lizardman shaman (Standard) | 67 | 1/1,066.67 |
 Lobstrosity | 10 | 6/118 |
 Locust rider (Ranger) | 67 | 1/5,461.33 |
 Lost mahogany crate | 100 | 1/8 |
| Lundail (Easy Wilderness diary) | 40 | 1/7 |
| Lundail (Elite Wilderness diary) | 200 | 1/7 |
| Lundail (Hard Wilderness diary) | 120 | 1/7 |
| Lundail (Medium Wilderness diary) | 80 | 1/7 |
 Lynx Tamer | 1 | 1/128 |
 Mad Angel (Post-quest) | 20–25 | 8/150 |
| Mad Angel (Post-quest) | 67 | 1/3,200 |
| Magic Stall | 1 | 1/20 |
 Mammoth (Normal) | 67 | 1/2,730.67 |
 Mature custodian stalker | 67 | 1/4,565.33 |
 Miala (Normal) | 10 | 12/256 |
 Mithril dragon | 67 | 1/5,461.33 |
 Molanisk | 1–5 | 3/128 |
 Monstrous basilisk | 15 | 5/128, 3 rolls |
| Monstrous basilisk | 37 | 1/128, 3 rolls |
 Moonlight Cockatrice | 5 | 6/128 |
| Moonlight Cockatrice | 8 | 4/128 |
| Moonlight Cockatrice | 10 | 2/128 |
 Moss Giant | 6–25 | 3/128 |
| Moss giant (Regular) | 6 | 3/128 |
 Mountain troll (Level 69) | 7 | 5/128 |
| Mourner (Level 108) | 12 | 5/128 |
 Mutated Bloodveld | 67 | 1/1,820.44 |
| Mystery box (Entrana) | 20 | 1/15 |
| Mystery box (Entrana) | 67 | 1/640 |
| Mystery box (Members) | 20 | 1/15 |