Ocean Life Crossword Puzzles: Free Printable and Online

Dive into the mysterious and vibrant world of ocean life. From microscopic plankton to colossal whales, discover fascinating creatures and ecological wonders that often surface in crossword puzzles.

Print any ocean life crossword below, download it as a PDF, or play it online. Free, and no signup is needed to play.

10 puzzles, click Print on any puzzle below

Shark Week

Medium · 11×11 · 15 words
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Across

  1. 2. One of the five senses, surprisingly keen even in dark water
  2. 4. Dermal denticles that feel like sandpaper
  3. 7. The sensitive nose area packed with electrical sensors
  4. 8. Microscopic food source for the massive Whale Shark
  5. 11. Sharp objects a shark may lose and replace thousands of times
  6. 12. Iconic 1975 blockbuster that made people afraid to go in the water
  7. 13. A common large shark named for its dark or dim coloring

Down

  1. 1. The appendages often seen slicing through the ocean surface
  2. 2. A large group of sharks swimming together
  3. 3. Aggressive shark that can survive in both salt and fresh water
  4. 5. Flexible tissue that makes up a shark's entire skeleton
  5. 6. Oil found in shark livers used in some cosmetics
  6. 8. Seal or tuna, from the perspective of a hungry bull shark
  7. 9. An extremely rare encounter between a shark and a human
  8. 10. A bottom-dwelling shark often seen resting on the sand

Shark Week

Medium · 11×11 · 14 words
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Across

  1. 1. The caudal appendage that propels a marine predator forward
  2. 2. What most sharks must constantly do to keep water flowing over their respiratory organs
  3. 7. Striped predator nicknamed the garbage can of the sea
  4. 8. Microscopic organisms consumed in massive quantities by the whale shark
  5. 10. Fluid that some sharks can supposedly detect a single drop of from miles away
  6. 11. The channel that broadcasts the rival SharkFest event
  7. 12. Where elusive species like the lanternshark reside

Down

  1. 1. They are continuously replaced and arranged in multiple rows
  2. 3. Type of epaulette shark recently discovered in Papua New Guinea that can traverse exposed reefs
  3. 4. The fastest shark in the sea, known for its incredible leaping ability
  4. 5. Extinct prehistoric giant that dwarfed modern marine hunters
  5. 6. Flexible tissue that makes up a shark's skeleton instead of bone
  6. 9. Spooky nickname for the chimaera, a deep-sea relative of sharks discovered off Costa Rica in 2026
  7. 10. What a marine hunter does to test if an object is edible

Ocean Life

Easy · 11×11 · 13 words
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Across

  1. 1. The largest mammal living in the sea
  2. 3. A type of large brown seaweed that grows in underwater forests
  3. 4. A burrowing shellfish with two hinged shells
  4. 6. A fan-shaped shellfish known for its ability to swim by clapping its shells
  5. 9. A small fish with a head like a land animal and a curled tail
  6. 11. A large black and white predator also known as a killer whale
  7. 12. A colorful flower-like animal that lives on rocks

Down

  1. 1. A large arctic animal with long tusks
  2. 2. A semi-aquatic mammal with flippers that lives in cold waters
  3. 5. An eight-armed creature that can release ink
  4. 7. A flightless bird that swims in the southern oceans
  5. 8. A gentle slow-moving herbivore often called a sea cow
  6. 10. A simple porous animal that filters water for food

Ocean Life

Hard · 11×11 · 14 words
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Across

  1. 2. Gaping eel with a hidden second bite.
  2. 5. Forest foliage that requires no soil, just sea.
  3. 6. Bug-eyed bottom dweller hiding in empty shells.
  4. 7. A flat kite soaring through the water.
  5. 10. Clinging crustacean that ruins a smooth hull.
  6. 11. Toothy apex predator older than trees.
  7. 12. A spiraled shell that doubles as a blowing horn.
  8. 14. Living in the open sea, unbound by the shore.

Down

  1. 1. Shrimp's sighted roommate in the sand.
  2. 3. Deeply profound, like the lightless ocean floor.
  3. 4. Pod person of the marine mammalian variety.
  4. 8. Sea cow known for its slow, grazing lifestyle.
  5. 9. A sea hedgehog stepping on which ruins a beach vacation.
  6. 13. The tuxedo-clad terror of the seal.

Ocean Life

Medium · 11×11 · 16 words
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Across

  1. 1. Sideways-walking crustacean protected by a hard exoskeleton
  2. 2. Bivalve mollusk frequently dug up from sandy coastal flats
  3. 6. Porous, immobile organism anchored to the sea floor
  4. 7. Reef builder that appears stony but is actually an animal
  5. 9. Stinging polyp that forms a mutualistic bond with clownfish
  6. 10. Snakelike fish that often lurks in rocky crevices
  7. 12. Swarming micro-crustaceans that sustain the largest animals on earth
  8. 13. Coastal phenomenon governed by the gravitational pull of the moon
  9. 14. Flat, cartilaginous fish that seems to fly through the water
  10. 15. Marine reptile that instinctively navigates back to its birth beach

Down

  1. 1. Large sea snail whose empty shell is blown like a horn
  2. 3. Gentle, slow-moving creature affectionately called a sea cow
  3. 4. Flipper-footed marine mammal that spends half its life on ice
  4. 5. Stubborn crustacean that permanently cements itself to boat hulls
  5. 8. Bottom-dwelling crustacean with formidable crushing claws
  6. 11. Largest member of the oceanic dolphin family

Ocean Life

Easy · 11×11 · 15 words
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Across

  1. 1. Microscopic organisms drifting in the sea
  2. 5. Crustacean with broad carapace and pincers
  3. 6. Simple aquatic animal with a porous body
  4. 8. Large water bird with a distinct throat pouch
  5. 12. Large, fast-swimming oceanic fish
  6. 13. Small crustacean that attaches to rocks and ship bottoms
  7. 14. Long, snake-like fish

Down

  1. 2. Large marine crustacean with a muscular tail and claws
  2. 3. Also known as the killer whale
  3. 4. Large brown seaweed that grows in underwater forests
  4. 6. Small swimming crustacean popular as seafood
  5. 7. Large, slow-moving aquatic mammal also called a sea cow
  6. 9. Simple nonflowering aquatic plant
  7. 10. Flippered marine mammal often found on ice floes
  8. 11. Flat-bodied cartilaginous fish related to sharks

Ocean Life

Hard · 11×11 · 13 words
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Across

  1. 1. Living in the open water far from any shore
  2. 6. A slippery shocker hidden in the crevices
  3. 8. Inkjet printer of the abyss
  4. 11. The rhythmic pulse of the moons gravity
  5. 12. A cartilaginous predator that must keep moving
  6. 13. A floating bell named for a mythological gorgon

Down

  1. 2. Pertaining to depths where light is only a memory
  2. 3. The tiny foundation of the polar food web
  3. 4. A flowery home for a clown
  4. 5. A coiled fossil that once swam in circles
  5. 7. Life at the very bottom of the scale
  6. 9. The stony skeletal architect of the reef
  7. 10. A monochromatic wolf of the waves

Ocean Life

Hard · 11×11 · 14 words
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Across

  1. 2. Tusked mammal, 'raw sul' could describe its state.
  2. 4. Slippery creature, sounds like a letter.
  3. 5. One who catches, or a 'fresh' start to a sea tale.
  4. 8. Microscopic marine life, often the 'plan' for a whale's meal, 'knot' in a sea.
  5. 11. Small crustacean, often 'rip sh' apart when preparing.
  6. 12. Spiny creature, a 'rich un' of the sea.
  7. 13. Marine mammal, also a way to close something.

Down

  1. 1. Underwater ridge, 'free' from above.
  2. 2. Ocean's movement, also a greeting.
  3. 3. Predatory fish, a 'dark' presence in the depths.
  4. 6. Echinoderm, a 'fish' that shines in the sea.
  5. 7. A sea flower, often a 'nem o' one.
  6. 9. Large seaweed, needs 'help' to stand tall underwater.
  7. 10. Breathing organ, a little girl's name perhaps.

Ocean Life

Medium · 11×11 · 15 words
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Printing for a class?

Print 2 or 4 versions of this puzzle with different grid layouts, so desk neighbors cannot copy answers. Same words and clues, and each version has its own answer key. Class sets are a Plus feature in the Grid Genius app.

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Across

  1. 3. Large brown seaweed, forms underwater forests.
  2. 4. Hard substance made by marine polyps.
  3. 9. Playful, intelligent marine mammal.
  4. 10. Long, slender, snakelike fish.
  5. 11. The primary body of saltwater on Earth.
  6. 12. Propulsion or steering appendage of a fish.
  7. 13. Protective outer covering of many mollusks.

Down

  1. 1. Sandy stretch found at water's edge.
  2. 2. Breathing organ for most aquatic animals.
  3. 5. Vast ocean dividing Europe and America.
  4. 6. Tiny crustaceans, vital food for baleen whales.
  5. 7. Cartilaginous fish, often a top predator.
  6. 8. Sea creature resembling a colorful flower.
  7. 9. Mariana Trench descriptor.
  8. 11. Black and white marine mammal, also known as killer whale.

Ocean Life

Hard · 11×11 · 14 words
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Printing for a class?

Print 2 or 4 versions of this puzzle with different grid layouts, so desk neighbors cannot copy answers. Same words and clues, and each version has its own answer key. Class sets are a Plus feature in the Grid Genius app.

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Across

  1. 1. Intelligent invertebrate that sounds like an autumnal feline.
  2. 5. Edible mollusk that represents a lonely expression without the Y.
  3. 6. Barking marine mammal that can close a letter.
  4. 8. A gentle sirenian, or a gentleman at ease missing the sea.
  5. 10. Stinging swimmer that is also a beam of sunlight.
  6. 11. Crustacean clinging to a farm building.

Down

  1. 1. Toothy predator hidden in major capitals.
  2. 2. Microscopic drifters making a board weigh two thousand pounds.
  3. 3. Absorbent animal known to mooch off friends.
  4. 4. Deep oceanic abyss that doubles as a classic raincoat.
  5. 6. Ten-armed cephalopod that could be worth a British pound.
  6. 7. Flower-like predator that sounds like a foe to no one.
  7. 9. Pincered beachcomber known for its complaining attitude.
  8. 10. Underwater ecosystem that makes calls on the football field.

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Ocean Life Crossword FAQ

Is this Ocean Life crossword puzzle free?

Yes. Every Ocean Life crossword on this page is free. You can print it, download it as a PDF, or play it online without paying anything or creating an account.

Can I print the Ocean Life crossword?

Yes. Click Print on any puzzle for a print-ready page with the grid, the clues, and a name and date line, or use Download to save it as a PDF, PNG, or JPEG for photocopying. The PDF download includes a filled answer key on the last page for grading.

Can students play these crosswords online?

Yes. Every puzzle has a Play online link that opens in the browser on any device. No app install and no signup is needed to play, which makes it easy to share with a class.

Can I make my own Ocean Life crossword?

Yes. The free Grid Genius crossword maker builds a puzzle from your own words and clues, with a printable grid and answer key. The Grid Genius app can also generate a complete crossword from any topic you type.