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- Canyon Cruise
- Capital City
- Capsule
- Captain Jelly
- Captain Jelly (DS)
- Captain Plunder
- Captain Whisker
- Captain Whisker and Johnny (boss)
- Capture
- Capture Berry
- Card Attack
- Card Float
- Card Spin
- Card Spin Boost
- Card Stomp
- Carl Flint
- Carnival Night Zone
- Carnival Town
- Caron Forest
- Carrier Zone
- Carronade
- Carrotia
- Carrotia (boss)
- Casey Robertson
- Casino Course
- Casino Forest
- Casino Night
- Casino Night (Sonic Drift 2)
- Casino Night (Sonic Generations)
- Casino Night (Sonic Generations 3DS)
- Casino Night (Sonic the Fighters)
- Casino Night Zone
- Casino Paradise Zone
- Casino Park
- Casino Park (ASR)
- Casino Pawn
- Casino Ring
- Casino Street Zone
- Casinopolis
- Cat
- Catakiller, Jr.
- Catalurcher
- Catch Eggman
- Catch Me If You Can
- Catcher Eggman
- Caterkiller
- Caterkiller (Sonic the Hedgehog 16-bit)
- Caterkiller (Sonic the Hedgehog 8-bit)
- Caterpillar
- Catfish
- Cavern Island
- Central City
- Central City (Shadow the Hedgehog)
- Central City (Sonic Battle)
- Central City (Sonic Chronicles: The Dark Brotherhood)
- Chaclon
- Chain Letter
- Chainspike
- Chao
- ChaoSaX
- ChaoSaX-RXL
- Chao Adventure
- Chao Adventure 2
- Chao Attack
- Chao Egg
- Chao Garden
- Chao In Space
- Chao In Space/Merchandise
- Chao Karate
- Chao Kindergarten
- Chao Pod
- Chao Race
- Chao Ruins
- Chao Walker
- Chao World
- Chao container
- Chao raising
- Chaoji Yinsu Xiaozi: Super Sonik II
- Chaomega
- Chaos
- Chaos (disambiguation)
- Chaos (level editor)
- Chaos 0
- Chaos 2
- Chaos 4
- Chaos 6
- Chaos Angel
- Chaos Blast
- Chaos Boost
- Chaos Control
- Chaos Control Freaks
- Chaos Council
- Chaos Drive
- Chaos Emerald Chaos
- Chaos Emeralds
- Chaos Energy Cannon
- Chaos Gamma
- Chaos Inferno
- Chaos Island
- Chaos Rings
- Chaos Spear
- Chaotic Inferno Zone
- Chaotic Space Zone
- Chaotix
- Chaotix/Bugs
- Chaotix/Comparisons
- Chaotix/Development
- Chaotix/Hidden content
- Chaotix/Magazine articles
- Chaotix/Manuals
- Chaotix/Maps
- Chaotix/Promotional material
- Chaotix/Region coding
- Chaotix (characters)
- Chaotix (prototype 0111)
- Chaotix (prototype 0111)/Comparisons
- Chaotix (prototype 0111)/Comparisons/Amazing Arena
- Chaotix (prototype 0111)/Comparisons/Characters
- Chaotix (prototype 0111)/Comparisons/Special Stage
- Chaotix (prototype 0111)/Comparisons/Speed Slider
- Chaotix (prototype 0111)/Comparisons/Techno Tower
- Chaotix (prototype 0111)/Comparisons/World Entrance
- Chaotix (prototype 0119)
- Chaotix (prototype 0119)/Comparisons
- Chaotix (prototype 0119)/Comparisons/Amazing Arena
- Chaotix (prototype 0119)/Comparisons/Isolated Island
- Chaotix (prototype 0119)/Comparisons/Marina Madness
- Chaotix (prototype 0119)/Comparisons/Special Stage
- Chaotix (prototype 0119)/Comparisons/Speed Slider
- Chaotix (prototype 0119)/Comparisons/Techno Tower
- Chaotix (prototype 0119)/Comparisons/World Entrance
- Chaotix (prototype 0119)/Hidden content
- Chaotix (prototype 0202)
- Chaotix (prototype 0202)/Comparisons
- Chaotix (prototype 0202)/Comparisons/Amazing Arena
- Chaotix (prototype 0202)/Comparisons/Isolated Island
- Chaotix (prototype 0202)/Comparisons/Special Stage
- Chaotix (prototype 0202)/Comparisons/Speed Slider
- Chaotix (prototype 0202)/Comparisons/Techno Tower
- Chaotix (prototype 0202)/Comparisons/World Entrance
- Chaotix (prototype 0208)
- Chaotix (prototype 0208)/Comparisons
- Chaotix (prototype 0208)/Comparisons/Bonus Stage
- Chaotix (prototype 0208)/Comparisons/Special Stage
- Chaotix (prototype 0208)/Comparisons/Speed Slider
- Chaotix (prototype 0208)/Comparisons/World Entrance
- Chaotix (prototype 0209)
- Chaotix (prototype 0210)
- Chaotix (prototype 0210)/Comparisons
- Chaotix (prototype 0213)
- Chaotix (prototype 0213)/Comparisons
- Chaotix (prototype 0214)
- Chaotix (prototype 0216)
- Chaotix (prototype 1207)
- Chaotix (prototype 1207)/Comparisons
- Chaotix (prototype 1207)/Comparisons/Amazing Arena
- Chaotix (prototype 1207)/Comparisons/Bonus Stage
- Chaotix (prototype 1207)/Comparisons/Botanic Base
- Chaotix (prototype 1207)/Comparisons/Characters
- Chaotix (prototype 1207)/Comparisons/Isolated Island
- Chaotix (prototype 1207)/Comparisons/Marina Madness
- Chaotix (prototype 1207)/Comparisons/Special Stage
- Chaotix (prototype 1207)/Comparisons/Speed Slider
- Chaotix (prototype 1207)/Comparisons/Techno Tower
- Chaotix (prototype 1207)/Comparisons/World Entrance
- Chaotix (prototype 1207)/Hidden content
- Chaotix (prototype 1227)
- Chaotix (prototype 1227)/Comparisons
- Chaotix (prototype 1227)/Comparisons/Amazing Arena
- Chaotix (prototype 1227)/Comparisons/Marina Madness
- Chaotix (prototype 1227)/Comparisons/Special Stage
- Chaotix (prototype 1227)/Comparisons/Speed Slider
- Chaotix (prototype 1227)/Comparisons/World Entrance
- Chaotix (prototype 1227)/Hidden content
- Chaotix (prototype 1229)
- Chaotix (prototype 1229)/Comparisons
- Chaotix (prototype 1229)/Comparisons/Bonus Stage
- Chaotix (prototype 1229)/Comparisons/Isolated Island
- Chaotix (prototype 1229)/Comparisons/Special Stage
- Chaotix (prototype 1229)/Comparisons/Techno Tower
- Chaotix (prototype 1229)/Comparisons/World Entrance
- Chaotix (prototype 1229)/Hidden content
- Chaotix Character Statistics Editor
- Chaotix Recital
- Chaotix final boss
- Chaotix penultimate boss
- Charge Master
- Charged Dash
- Charged Wrench Attack
- Charles Campbell
- Charles Martinet
- Charmy Bee
- Charmy Bee in Sonic the Hedgehog
- Cheat Codes:Shadow the Hedgehog (game)
- Cheat Codes:Sonic Adventure
- Cheat Codes:Sonic Adventure 2
- Cheat Codes:Sonic Adventure 2: Battle
- Cheat Codes:Sonic Riders
- Cheat Codes:Sonic Riders: Zero Gravity
- Cheat Codes:Sonic Rush
- Cheat Codes:Sonic and the Black Knight
- Cheat Codes - Sonic the Hedgehog 2 (Megatech)
- Checkpoint
- Cheese
- Cheetah
- Cheetos Sonic X Nox Pogs
- Cheezlet
- Chemical Plant (Sonic Forces)
- Chemical Plant (Sonic Generations)
- Chemical Plant Zone
- Chemical Plant Zone (Sonic Mania)
- Chez Amy
- Chicle Sonic the Hedgehog
- Chikao Otsuka
- Chili Dog
- Chili Dog Day Afternoon
- Chilly Castle
- ChimpoQ!
- Chip
- Chip McCallahan in Sonic the Hedgehog
- Chip McCallahan in Sonic the Hedgehog 2
- Chocola
- Choo
- Choopaloo
- Chop Chop
- Chopper
- Chopper (Sonic the Hedgehog 16-bit)
- Chopper (Sonic the Hedgehog 8-bit)
- Chosen One
- Chris Hernandez
- Chris Thorndyke
- Chris Turner
- Christian Whitehead interview by Glixel (September 7, 2017)
- Christina Cooper
- Christmas Island
- Christopher Stephen Welch
- Chroma-Cammo
- Chrome Gadget
- Chuck
- Chuck Thorndyke
- Churdle
- Cindy Robinson
- Circles Shoot
- Circus
- Circus (Sonic Lost World)
- Circus Park
- Circus of Plunders
- City
- City Course
- City Escape
- City Escape (Sonic Generations)
- City Top
- Clam
- Clamer
- Clash in the Cloister
- Classic Sonic Bundle
- Cliffhanger Flip
- Clockwork Pyramid
- Close Encounter of the Sonic Kind
- Closed Door Policy
- Cloud Sanctuary
- Clove Sea
- ClownMapEd
- Club Rouge
- Cluck
- Cluckbird
- Clucker
- Cluckoid
- Coachnik
- Coastal Valley
- Coco Island
- Cocoa Island
- Coconut Crew
- Coconuts
- Coconuts (AoStH)
- Coffret Sonic
- Coldflame
- Colleen Villard
- Collision Chaos
- Colosseum
- Colosseum Highway Zone
- Combat Hover Pod
- Combat Mini-Sub
- Combat Walker
- Combi Confiner
- Combine Ring
- Come Out Wherever You Are
- Comic book
- Commander Brutus
- Commander Syrax
- Commander Walters
- Compilations which include Sonic the Hedgehog games
- Complete Trinity Sonic Heroes - Original Soundtrax
- Condor
- Condor (badnik)
- Conductor
- Connor Bringas
- Continue
- Cool Edge
- Cop Speeder
- Copter Combo
- Coral Cave
- Corey Bringas
- Corkey
- Cosmic Angel Zone
- Cosmic Casino Zone
- Cosmic Casino Zone Boss
- Cosmic Crisis
- Cosmic Eternity - Believe in Yourself
- Cosmic Fall
- Cosmic Wall
- Cosmo
- Countdown to Chaos
- Counter Productive
- Country Crisis
- Cowbot (episode)
- Crab
- Crabmeat
- Crabmeat (Sonic the Hedgehog 16-bit)
- Crabmeat (Sonic the Hedgehog 8-bit)
- Cracking Down
- Cracking Knuckles
- Crawl
- Crawlton
- CrazySonic
- Crazy Carl
- Crazy Gadget
- Cream Flower Catch
- Cream and Cheese in Sonic the Hedgehog
- Cream the Rabbit
- Creeper Gorge
- Crimson Crater
- Crimson Eye
- Crisis City
- Crisis City (Sonic Generations)
- Croc-Attack
- Crock
- Croesus
- Cross Dozer
- Cross Slash
- Cruise Blues
- Crush 40
- Crush 40 (album)
- Cry of the Wolf
- Cryptic Castle