Ralpharia is a genus of hydrozoans belonging to the family Tubulariidae.

The species of this genus are found in Australia, Malesia and America.

Species:

• Ralpharia coccinea Watson, 1984
• Ralpharia gorgoniae Petersen, 1990
• Ralpharia magnifica Watson, 1980
• Ralpharia multitentaculata (Fraser, 1938)
• Ralpharia neira Petersen, 1990
• Ralpharia parasitica (Korotneff, 1887)
• Ralpharia rosetta Watson, 1999
• Ralpharia sanctisebastiani (Da Silveira & Migotto, 1984)

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