***Styracosaurus*** adalah genus dinosaur ceratopsian maun dari Tempoh Zaman Batu Kapur (peringkat *Campanian*), kira-kira 75.5 hingga 75 juta tahun yang lalu. Ia memiliki empat hingga enam tanduk panjang yang kembang dari ropol lehernya , tanduk yang lebih kecil pada setiap pipinya, dan satu tanduk tunggal yang menonjol dari hidungnya, yang mungkin telah mencapai 60 sentimeter (2 kaki) panjang dan 15 sentimeter (6 inci) lebar. Fungsi tanduk dan ropol lehernya telah dibahaskan selama bertahun-tahun.

*Styracosaurus* adalah dinosaur yang agak besar, mencapai panjang 5.5 meter (18 kaki) dan seberat hampir 3 tan. Ia berdiri kira-kira 1.8 meter (6 kaki) tinggi. Styracosaurus mempunyai empat kaki pendek dan badan yang besar. Ekornya adalah agak pendek. Tengkorak mempunyai paruh dan gigi pipa ricih disusun dalam susunan pergigian yang berterusan, menunjukkan bahawa haiwan itu mencincang tumbuh-tumbuhan. Seperti ceratopsian lain, dinosaur ini mungkin haiwan berkawanan, yang bergerak dalam kumpulan besar, seperti yang dicadangkan oleh timbunan tulang.

Dinamakan oleh Lawrence Lambe pada tahun 1913, *Styracosaurus* adalah ahli Centrosaurinae. Satu spesies, *S. albertensis*, kini diletakkan pada *Styracosaurus*. Spesies lain yang pernah diletakkan pada genus ini telah diletakkan semula di tempat lain.


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| Centrosaurinae | 

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|   | *Diabloceratops eatoni* |
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| Nasutoceratopsini | 

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|   | *Avaceratops lammersi* (ANSP 15800) |
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|   | MOR 692 |
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|   | CMN 8804 |
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|   | *Nasutoceratops titusi* |
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|   | Malta new taxon |
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|   | *Xenoceratops foremostensis* |
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|   | *Albertaceratops nesmoi* |
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|   | *Sinoceratops zhuchengensis* |
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|   | *Wendiceratops pinhornensis* |
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| Pachyrhinosaurini | 

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|   | *Einiosaurus procurvicornis* |
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|   | *Achelousaurus horneri* |
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| *Pachyrhinosaurus* | 

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|   | *Pachyrhinosaurus canadensis* |
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|   | *Pachyrhinosaurus lakustai* |
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|   | *Pachyrhinosaurus perotorum* |
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| Centrosaurini | 

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|   | *Rubeosaurus ovatus* |
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|   | ***Styracosaurus albertensis*** |
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|   | *Spinops sternbergorum* |
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|   | *Centrosaurus apertus* |
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|   | *Coronosaurus brinkmani* |
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