Tidal wave may refer to:

• A tidal bore, which is a large movement of water formed by the funnelling of the incoming tide into a river or narrow bay
• A storm surge, or tidal surge, which can cause waves that breach flood defences
• A tsunami, a series of water waves in a body of water caused by the displacement of a large volume of water, although this usage of "tidal wave" is a misnomer and is disfavored by the scientific community.
  • A megatsunami, which is an informal term to describe a tsunami that has initial wave heights that are much larger than normal tsunamis
• The crest (physics) of a tide as it moves around the Earth

• The Tidal Wave, a 1920 British silent film
• Tidal Wave (1973 film), a film based on novel Japan Sinks
• Tidal Wave (2009 film), a South Korean disaster movie

• Tidal Wave (Thorpe Park), the theme park ride at Thorpe Park, in the United Kingdom
• Tidal Wave (Transformers), a Decepticon in the Transformers universe

• Tidal Wave (band), a band associated with the United States Naval Academy Band

• Tidal Wave (EP), the 1993 EP debut release by The Apples in Stereo, and song on the album Fun Trick Noisemaker
• Tidal Wave (Taking Back Sunday album), a 2016 album by Taking Back Sunday
• Tidal Wave (Young Liars album), a 2014 album by Canadian indie pop rock band Young Liars

• "Tidal Wave" (song), a song by Sub Focus, 2012
• "Tidal Wave", a song by The Apples, 1993
• "Tidal Wave", a song by Apollo 100, 1973
• "Tidal Wave", a song by the band The Challengers, 1963
• "Tidal Wave", a song by Clancy Eccles, 1976
• "Tidal Wave", a song by Gorky's Zygotic Mynci, on their 1998 album Gorky 5
• "Tidal Wave", a song by Frankie Paul, 1985
• "Tidal Wave," a 1995 song by Bomb the Bass featuring River on their album Clear
• "Tidal Wave", a song by Husky, 2012
• "Tidal Wave," a 2014 song by Interpol on their album El Pintor
• "Tidal Wave", a song by John Foxx on his 1980 album Metamatic
• "Tidal Wave", a song by Karmin from Pulses
• "Tidal Wave", a B-side to 2008 single "Spaceman" by the rock band The Killers
• "Tidal Wave", a song by Owl City on their 2009 album Ocean Eyes
• "Tidal Wave", a song by Nickelback on their 2022 album Get Rollin'
• "Tidal Wave", a song by Ronnie Laws and Pressure, 1975
• "Tidal Wave", a song by The Sugarcubes on the 1989 album Here Today, Tomorrow Next Week!
• "Tidal Wave", a song by Thee Oh Sees
• "Tidal Wave", a song by The Upsetters
• "Tidal Wave", a song by Portugal. The Man
• "Tidal Wave", a song by S*M*A*S*H
• "Tidal Waves", a 2015 song by All Time Low from Future Hearts
• "Tidal Wave", a 1974 song by The Ozark Mountain Daredevils from It'll Shine When It Shines
• "Tidal Wave", a song by Chase Atlantic, 2018

• Operation Tidal Wave, a 1943 World War II military operation
• Tidalwave Microtech, defunct Taiwanese manufacturer of palmtop PCs

• A rogue wave of up to 100 feet high, often in the middle of the ocean and against prevailing current and wave direction
• Jwar Bhata (disambiguation) (lit. 'Tidal Wave'), various Indian films so titled