Science Crossword Puzzles: Free Printable and Online

Explore the fundamental principles and latest discoveries across physics, chemistry, biology, and astronomy. This topic covers scientific methods and breakthroughs.

Print any science 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

Space and planets

Easy · 5×5 · 4 words
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Across

  1. 1. The state of matter that makes up the giant planets like Jupiter.
  2. 3. The second planet from the sun.

Down

  1. 2. The star at the center of our solar system.
  2. 4. The region of the atmosphere and outer space seen from the ground.

biology

Easy · 7×7 · 6 words
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Across

  1. 2. Living organism that typically produces its own food via photosynthesis
  2. 5. Organ that filters waste from the blood
  3. 6. The command center of the nervous system

Down

  1. 1. Protein that speeds up chemical reactions in the body
  2. 3. Organ used for breathing
  3. 4. Large organ that cleans the blood and produces bile

Astronomy

Easy · 7×7 · 7 words
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Across

  1. 1. The physical universe beyond the Earth's atmosphere.
  2. 4. A small body of matter from outer space that enters the atmosphere and glows.
  3. 5. A completely empty area in the universe.
  4. 6. The star at the center of our solar system.

Down

  1. 2. A dwarf planet located in the Kuiper belt.
  2. 3. The curved path of a celestial object around a star or planet.
  3. 4. The fourth planet from the sun known as the Red Planet.

Astronomy

Easy · 5×5 · 4 words
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Across

  1. 1. The United States agency responsible for the civilian space program
  2. 3. A luminous sphere of plasma held together by its own gravity

Down

  1. 2. The vast expanse beyond the atmosphere of Earth
  2. 3. The region of the atmosphere and outer space seen from the ground

Famous Inventors

Medium · 11×11 · 15 words
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Across

  1. 2. Firearm innovator Samuel
  2. 5. Hungarian architecture professor behind a famous 3D puzzle
  3. 6. Whitney who revolutionized Southern agriculture
  4. 8. Knighted computer scientist Berners-Lee
  5. 9. Visionary mathematician Ada who saw the potential of the Analytical Engine
  6. 12. Two-time Nobelist who developed mobile radiography units
  7. 13. Prolific engineer Granville who improved railway telegraphy
  8. 14. Explosives magnate who left a legacy of peace
  9. 15. British inventor who ditched the vacuum bag

Down

  1. 1. Biochemist Katalin whose mRNA research changed modern medicine
  2. 3. His braking system lifted the limits on building heights
  3. 4. French microbiologist who made dairy safe to drink
  4. 7. Italian credited with the first transatlantic radio signal
  5. 10. Phonograph pioneer known as the Wizard of Menlo Park
  6. 11. Rival of Edison who championed alternating current

Science and Technology

Medium · 11×11 · 13 words
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Across

  1. 1. Preserved remains or traces of an ancient organism
  2. 5. A room or building used for scientific research
  3. 7. Information processed or stored by a computer
  4. 9. Step-by-step procedure for solving a problem or task
  5. 10. A tiny slice of semiconducting material used in electronics
  6. 11. Submicroscopic agent that replicates only inside living cells
  7. 12. Physics branch dealing with the very small and discrete

Down

  1. 2. The range of all types of electromagnetic radiation
  2. 3. System of signals or symbols used to represent instructions
  3. 4. Artificial body placed in orbit to collect information
  4. 6. The fundamental building block of ordinary matter
  5. 8. A change in the DNA sequence of an organism
  6. 10. The basic structural and functional unit of all organisms

Astronomy

Easy · 7×7 · 7 words
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Across

  1. 1. The fourth planet from the sun known as the red planet
  2. 5. The blue gas giant furthest from the sun
  3. 6. The only planet known to support life

Down

  1. 1. The natural satellite that orbits the Earth
  2. 2. A ball of ice and dust with a long glowing tail
  3. 3. The vast area beyond the atmosphere of Earth
  4. 4. The star at the center of our solar system

aryrsj

Easy · 7×7 · 7 words
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Printing for a class?

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Across

  1. 1. The fourth planet from the sun known as the Red Planet
  2. 5. The windy blue gas giant furthest from the sun
  3. 6. Matter that makes up giant planets like Jupiter

Down

  1. 1. The natural satellite that orbits the Earth
  2. 2. The vast empty region beyond Earths atmosphere
  3. 3. The star at the center of our solar system
  4. 4. The hottest planet in our solar system

aryrsj

Easy · 5×5 · 5 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 Pro feature in the Grid Genius app.

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Across

  1. 4. Bright objects seen in the night sky
  2. 5. The space above the Earth

Down

  1. 1. Small particles found in space clouds
  2. 2. What giant planets like Jupiter are made of
  3. 3. The planet known as the Red Planet

aryrsj

Easy · 7×7 · 7 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 Pro feature in the Grid Genius app.

Make a class set →
1
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4
5
6

Across

  1. 1. Bright celestial bodies visible in the night sky
  2. 5. A vehicle used to launch people into space
  3. 6. Tiny particles of matter found in space clouds

Down

  1. 1. The vast void that exists beyond Earths atmosphere
  2. 2. The star at the center of our solar system
  3. 3. The third planet from the Sun and our home
  4. 4. The hottest planet in our solar system

Make your own Science crossword

Turn your own word list into a crossword with the free Grid Genius maker. Print it with an answer key or share a playable link with your class. No account needed.

Make your own Science crossword

Related Printable Crossword Topics

Science Crossword FAQ

Is this Science crossword puzzle free?

Yes. Every Science 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 Science 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 Science 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.