Rheic may refer to:

• Rheic Ocean, a Paleozoic ocean between the large continent Gondwana to the south and the microcontinents Avalonia and others
• Rheic acid, a synonym for the molecule rhein

• Cruise vessel
• Cruisin' (album)
• Cruisin' Classics
• Cruisin' for a Bruisin' (Ol' 55 album)
• Cruising Bar
• Cruising Bar 2
• Cruising California
• Cruising in England and Wales
• Cruising Pavilion
• Cruisin' Grand
• Cruising With Elvis in Bigfoot's UFO
• Cruising with Elvis in Bigfoot's UFO
• Cruising with Jane McDonald
• Cruising with Jane McDonald (album)
• Cruisin' (Junko Onishi album)
• Cruisin' Music
• Cruisin' the 'Bird
• Cruis'n Blast
• Cruis'n (series)
• Cruisn USA
• Crula henryi
• Crula mandshurica
• Crula sutchuenensis
• Crull
• Cruls