Most Similar Movies to Tentacles (1977)
If you are looking for movies like Tentacles (1977), you might like movies tagged with keyword : horror, thriller, disaster, ocean, monster, sci-fi, mystery, gore, survival, revenge, animal attack, b-movie, lovecraftian, deep sea, 1970s, italian cinema, exploitation, man vs nature, tension, special effects .
Deep Rising (1998), The Burning Dead (2015), Sand Sharks (2011), Blood Lake: Attack of the Killer Lampreys (2014), Zombi 3 (1988), Sharknado (2013), Terror Birds (2016) ... Let's take a look at the following list...

Deep Rising (1998)
A group of heavily armed hijackers board a luxury ocean liner in the South Pacific Ocean to loot it, only to do battle with a series of large-sized, tentacled, man-eating sea creatures who had already invaded the ship.
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The Burning Dead (2015)
A sheriff must rescue an estranged family from a mountain during a volcano eruption and fight off a horde of lava-filled zombies brought to life by a curse.
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Sand Sharks (2011)
The residents of a small town team up to kill a group of evolved sharks that can swim in sand, and are terrorizing local beaches.
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Blood Lake: Attack of the Killer Lampreys (2014)
A down on his luck cubicle worker and his slacker best friend discover their new boss is a vampire who is turning their coworkers into the un-dead.
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Zombi 3 (1988)
When a terrorist's body, infected with a stolen chemical, is cremated by the US military, a virus is unintentionally released into the atmosphere over a small island.
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Sharknado (2013)
A monstrous storm devastates Los Angeles, leaving the streets flooded and infested with sharks.
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Terror Birds (2016)
When Maddy Stern discovers her father has gone missing during a routine birdwatching excursion, she and her college pals trek out into the wilderness to find him, only to end up in a wealthy scientist's desolate ranch aviary, where they encounter a pair of giant, hungry terror birds believed to be extinct for centuries.
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Zoombies (2016)
When a strange virus quickly spreads through a safari park and turns all the zoo animals undead, those left in the park must stop the creatures before they escape and zombify the whole city.
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Jaws 2 (1978)
Police chief Brody must protect the citizens of Amity after a second monstrous shark begins terrorizing the waters.
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Snakehead Terror (2004)
A small-town Maryland sheriff tries to kill mutated fish that can survive out of water.
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Mega Shark vs. Giant Octopus (2009)
Strange things are afoot in the depths of the sea. First a passenger plane vanishes over the Pacific Ocean. Then an oil platform is obliterated. Marine biologist Emma MacNeil (Deborah Gibson) is dispatched to investigate the phenomena, and, with the help of Japanese scientist Seiji Shimada (Vic Chao), she makes a discovery that will rock the world: An enormous prehistoric shark and a giant octopus have been awakened from their icy slumbers -- and they're hungry.
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Raiders of the Lost Shark (2014)
A prehistoric shark is released into a the waters near a small lake community as a result of an oil drilling accident, and proceeds to wreak havoc on nearby swimmers.
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Squirm (1976)
A storm causes some power lines to break and touch the ground, drawing millions of man-eating worms out of the earth, and into town where they quickly start munching on the locals.
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Deep Blue Sea 3 (2020)
Studying the effects of climate change off the coast of Mozambique, a marine biologist and her team confront three genetically enhanced bull sharks. Now, a new bloodbath is waiting to happen in the name of science. Will humans never learn?
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Tremors (1990)
Natives of a small isolated town defend themselves against strange underground creatures which are killing them one by one.
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Creature from the Black Lagoon (1954)
A strange prehistoric beast lurks in the depths of the Amazonian jungle. A group of scientists try to capture the animal and bring it back to civilization for study.
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Spiders 2 (2001)
After the events of Spiders (2000), a scientist conducts genetic tests, and a couple becomes the perfect host. Now, the hunt is on, as an army of arachnids is after the succulent human flesh. Who can stop the spiders' feeding frenzy?
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Ghost Shark (2013)
After rednecks torture and kill a great white shark, its spirit returns from the dead to seek revenge on the town of Smallport.
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