| Infernal shale rocks | 1 | 8/32,768 |
 Insatiable Bloodveld | 1 | 1/512, 3 rolls |
 Insatiable mutated Bloodveld | 1 | 1/829.57, 3 rolls |
 Iorwerth Archer (Female) | 1 | 1/409.6 |
 Iorwerth Warrior (Iorwerth Camp) | 1 | 1/409.6 |
 Irina | 1 | 1/8,192 |
 Iron dragon (Standard) | 1 | 1/618.26 |
| Iron rocks | 1 | 8/32,768 |
| Jelly | 1 | 1/512 |
| Jelly (Wilderness Slayer Cave) | 1 | 1/204.8 |
 Jennella | 1 | 1/8,192 |
 Jogre (Normal) | 1 | 1/2,064 |
 Joseph | 1 | 1/8,192 |
 Jungle horror (Worker) | 1 | 1/2,064 |
 Juvenile custodian stalker | 1 | 1/415.84 |
 K'ril Tsutsaroth | 1 | 1/625.23 |
 Kalphite Guardian | 1 | 1/397.19 |
 Kalphite Queen (Crawling) | 25 | 3/126 |
| Kalphite Queen (Crawling) | 1 | 1/12,902.4 |
 Kalphite Soldier (Kalphite Lair) | 1 | 1/512 |
 Kalphite Worker | 1 | 1/1,024 |
 Killerwatt (Idle) | 1 | 1/448 |
 King Black Dragon | 1 | 1/630.15 |
 King Bolren | 2–4 | 10/128 |
 King kurask | 1 | 1/330.67, 3 rolls |
 King Sand Crab (Active) | 1 | 1/2,048 |
 Kraka | 1 | 1/409.6 |
 Kraken (Kraken) | 1 | 1/1,024 |
 Kree'arra | 1 | 1/625.23 |
 Ksenia | 1 | 1/8,192 |
 Kurask (Normal) | 1 | 1/330.67 |
 Lanzig | 1 | 1/8,192 |
| Larran's big chest | 35–45 | 5/60 |
| Larran's small chest | 20–30 | 5/60 |
 Lava dragon | 1 | 1/374.49 |
| Lead rocks | 1 | 8/32,768 |
 Lensa | 1 | 1/8,192 |
| Lesser demon (Regular) | 1 | 1/512 |
| Lesser demon (Wilderness Slayer Cave) | 1 | 1/124.8 |
 Lev | 1 | 1/8,192 |
 Lieutenant Schepbur | 2–4 | 10/128 |
 Liliya | 1 | 1/8,192 |
| Limestone rock | 1 | 8/32,768 |
 Lizard | 1 | 1/341.33 |
 Lizardman shaman (Standard) | 1 | 1/2,560 |
 Lobstrosity | 1 | 1/629.33 |
 Locust rider (Ranger) | 1 | 1/135.13 |
| Lovakite rocks | 1 | 8/32,768 |