This category is for cryptids said to live in rivers or streams.

Not to be confused with the Animal Planet television show "River Monsters."
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- Lake Elsinore Monster
- Lake Tianchi Monster
- Lake Van Monster
- Lavellan
- List of Globsters and Blobs
- Lizard Man of Scape Ore Swamp
- Lizzie
- Llamhigyn Y Dwr
- Loch Awe Monster
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- Makara
- Mali
- Manhattan Monster
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- Matorepo Wera (Green Swamp Demon)
- Maumee River Monster
- Micro-Mermaid
- Migas
- Missouri River Monster
- Monongy
- Monsters of Pinatubo
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- Murray
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