Royal blue hap
Otopharynx heterodon
- Least concern
- Card rarity: Common
- Fish

The royal blue hap is a species of cichlid endemic to Lake Malawi. This species can reach a length of 12.8 centimetres (5.0 in) TL. It can also be found in the aquarium trade.
Classification
- Class
- Actinopterygii
- Order
- Cichliformes
- Family
- Cichlidae
- Genus
- Otopharynx