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- Sand box
- Sandbox
- Sandoom
- Sandopolis
- Sandopolis Zone
- Sandopolis Zone Boss
- Sandopolis Zone Sub-boss
- Sandra Jo
- Sandworm
- Sandy Cressman
- Sandy Cressman interview by Ryoga Masaki (September 2001)
- Sandy Cressman interview by Sega-16 (September 9, 2005)
- Sandy Drifts
- Sanzaru Games
- Saori Kobayashi
- Sara
- Sarah Wulfeck
- Sascha Biesi
- Sasori
- SatAM
- SatBK
- SatSR
- Satam
- Satellite Swindle
- Satoshi Okano
- Satoshi Sakai
- Satoshi Yokokawa
- Saturday Morning Sonic
- Saturn
- Saturn Analog gamepad
- Saturn Custom Sound Processor
- Saturn Mouse
- Saturn Previews - Sonic R (Electronic Gaming Monthly, December 1997)
- Saturn ProReview - Sonic R (GamePro, February 1998)
- Saturn digital gamepad
- Saturn double-speed CD-ROM drive
- Savannah Citadel
- Savestate
- Savestates
- Sawako Sogabe
- Saxman's Sonic Boom Engine
- Saxman Compression
- Saxman Format
- Saxman compression
- Sayaka Aoki
- Scaa
- Scabbard of Excalibur
- Scarab
- Scarabesque
- Scarlet Garcia
- Scavengers
- Sceners
- Scepter of Darkness
- Sclassic
- Scorpius
- Scorpy
- Scott Dreier
- Scott Drier
- Scott Fulop
- Scott Shaw
- Scott Shaw!
- Scourge
- Scourge the Hedgehog
- Scouter
- Scrambled Egg Zone
- Scrambled Shores
- Scrap Brain
- Scrap Brain (Sonic Drift)
- Scrap Brain Zone
- Scrap Brain Zone (8-bit)
- Scrap Brain Zone (GG)
- Scrapyard
- Scratch
- Screenshots
- Screentest - Sonic the Hedgehog (ACE, August 1991)
- Screw Kick
- Screw Mobile
- Screw Shoes
- Scylla
- Sea Fox
- Sea Gate
- Sea Lion Mecha
- Sea Otter
- Sea Tail
- Seagull Beach
- Seal
- Sean Schemmel
- Searching for 'Ultimate'
- Seaside Coast
- Seaside Course
- Seaside Hill
- Seaside Hill (ASR)
- Seaside Hill (Sonic Generations)
- Seaside Hill (Sonic Heroes)
- Seaside Island (Sonic Boom: Fire & Ice)
- Seasonal Shrines
- Second Wind
- Secret Base Zone
- Secret Document
- Secret Documents
- Secret Illustration
- Secret Illustrations
- Secret Item
- Secret Items
- Secret Jungle
- Secret Mission
- Secret Missions
- Secret Movie
- Secret Movies
- Secret Plant Zone
- Secret Plant Zone Boss
- Secret Rings
- Secret Soundtrack
- Secret Soundtracks
- Secret Stages
- Secret Zone
- Secrets of Sonic Team
- Secrets of Sonic the Hedgehog
- Sector Charyb
- Sector Charybdis
- Sector Scylla
- Security Corridor
- Security Hall
- Seduced By Taste of Blood
- Seeking a Silent Paradise
- Seeri
- Sega
- Sega-16
- SegaEMU
- SegaNet
- SegaSonic
- SegaSonic Arcade
- SegaSonic Bros.
- SegaSonic Bros./Hidden content
- SegaSonic Cosmo Fighter
- SegaSonic Cosmo Fighter/Comparisons
- SegaSonic Cosmo Fighter/Hidden content
- SegaSonic Cosmo Fighter Galaxy Patrol
- SegaSonic Cotton Candy Scramble
- SegaSonic Network
- SegaSonic Popcorn Shop
- SegaSonic Wataame Scramble
- SegaSonic the Hedgehog
- SegaSonic the Hedgehog/Development
- SegaSonic the Hedgehog/Hidden content
- SegaSonic the Hedgehog/Magazine articles
- SegaSonic the Hedgehog/Production credits
- SegaSonic the Hedgehog (LCD game)
- SegaSonic the Hedgehog (revision A)
- SegaSonic the Hedgehog (revision A)/Comparisons
- SegaSonic the Hedgehog (revision A)/Hidden content
- SegaSonic the Hedgehog magazine articles
- Sega 32X
- Sega 32x
- Sega 3D Classics Collection
- Sega AM1
- Sega AM1 (2005-current)
- Sega AM2
- Sega AM3
- Sega Activator
- Sega Ages: Sonic the Hedgehog
- Sega Ages: Sonic the Hedgehog 2
- Sega Ages (mobile)
- Sega Ages Sonic the Hedgehog
- Sega Ages Sonic the Hedgehog 2
- Sega Amusements
- Sega Amusements Europe
- Sega Amusements International
- Sega Amusements USA
- Sega Archives from USA Vol. 1
- Sega Archives from USA Vol. 2
- Sega Archives from USA Vol. 3
- Sega CD
- Sega CDX
- Sega CD PreView - Sonic the Hedgehog CD (GamePro, December 1993)
- Sega CD ProReview - Sonic the Hedgehog CD (GamePro, January 1994)
- Sega CS
- Sega CS1
- Sega CS2
- Sega CS3
- Sega Carnival
- Sega Channel
- Sega City (Raze, August 1991)
- Sega Digio II
- Sega Digio SJ-1
- Sega Digital Studio
- Sega Direct
- Sega Dreamcast
- Sega Dreamcast Broadband Adapter
- Sega Dreamcast VGA Adapter
- Sega Earth
- Sega Europe
- Sega Falcom
- Sega Family Fun Pak
- Sega Fun Pack: Sonic Mega Collection Plus & Shadow the Hedgehog
- Sega Fun Pack: Sonic Rivals 2 & Sega Genesis Collection
- Sega Fun Pack: Sonic Rush & Super Monkey Ball: Touch & Roll
- Sega Fun Pack: Sonic Rush & Super Monkey Ball Touch and Roll
- Sega Fun Pack: Sonic and the Secret Rings & Super Monkey Ball Banana Blitz
- Sega Game Feature - Sonic Chaos (Sega Visions, December 1994)
- Sega Game Feature - Sonic the Hedgehog CD (Sega Visions, December 1994)
- Sega Game Gear
- Sega Game Gear TV Tuner
- Sega Gamer's Day 1996
- Sega Genesis
- Sega Genesis Collection
- Sega Genesis Collection Volume 1
- Sega Genesis Collection Volume 2
- Sega Genesis Game Feature - Sonic the Hedgehog 3 (Sega Visions, February 1994)
- Sega Illusion
- Sega Interactive
- Sega Interactive Development Division
- Sega Jupiter
- Sega Magazin
- Sega Magazine (UK)
- Sega Mars
- Sega Master Pro Review - Sonic the Hedgehog (GamePro, December 1991)
- Sega Master System
- Sega Mega-CD
- Sega Mega Anser
- Sega Mega CD
- Sega Mega CD/Sega CD
- Sega Mega Drive
- Sega Mega Drive/Board Revisions
- Sega Mega Drive/Genesis
- Sega Mega Drive Portable Video Game Player
- Sega Mega Drive Ultimate Collection
- Sega Mega Drive Ultimate Collection (album)
- Sega Mega Drive gamepad
- Sega Mega Jet
- Sega Megadrive
- Sega Megadrive Handheld Console
- Sega Megadrive Ultimate Collection (Album)
- Sega Meganet Modem
- Sega Mercury
- Sega Mission Stick
- Sega Mobile
- Sega Model 2
- Sega Model 2B
- Sega Model 2B CRX
- Sega Multimedia Studio
- Sega Music
- Sega NAOMI
- Sega Neptune
- Sega NetLink
- Sega Nomad
- Sega PC
- Sega PC Mega Pack
- Sega PC Puzzle Pack
- Sega PC Smash Pack
- Sega PR FTP
- Sega Pico
- Sega Picture Magic
- Sega Pluto
- Sega Power
- Sega PriFun
- Sega Prize
- Sega Pro-Master Volume 1
- Sega Rally Championship
- Sega Republic
- Sega Retro
- Sega RingWide
- Sega Rocks the House of Sonic Blues
- Sega Rosso
- Sega Saturn
- Sega Saturn Magazine (JP)
- Sega Saturn Magazine (UK)
- Sega Saturn Models
- Sega Scream
- Sega Seal of Quality
- Sega Sector - Sonic R (GameFan, November 1997)
- Sega Smash Pack
- Sega Smash Pack 2
- Sega Smash Pack Vol. 1
- Sega Smash Pack Vol. 1 (PC)
- Sega Smash Pack Vol. 2
- Sega Smash Pack Volume 1
- Sega Smash Twin Pack
- Sega Sonic the Hedgehog Revision A Beta
- Sega Sound Team
- Sega Sports Design R&D Dept.
- Sega Studios USA
- Sega Superstars
- Sega Superstars Tennis
- Sega System 16
- Sega System 24
- Sega System 32
- Sega System C
- Sega System C2
- Sega Technical Institute
- Sega Technical Institute Burbank
- Sega Teradrive
- Sega Tunes: Virtual Sonic
- Sega UFO Catcher
- Sega Uranus
- Sega Venus
- Sega Visions
- Sega Wiki
- Sega cd
- Sega of America
- Sega of America - Sonic Origin Story Documents
- Sega of America - Sonic Origin Story Documents (Sonic Bible)
- Sega of Japan
- Sega planet codenames
- Segacon
- Segagaga
- Segasonic
- Segasonic the Hedgehog
- Segata Sanshiro
- Seggo
- Seirou Okamoto
- Select - Ninterrogation (Official Nintendo Magazine, November 2010)
- Semi
- Senbon
- Sentry Bug
- Sera
- Set Ark
- Set in Motion
- Setting Out in the Morning
- Seven Rings In Hand
- Seven Rings in Hand
- Seven Rings in Hand: Sonic and the Secret Rings Original Sound Track
- Seven Rings in Hand (Song)
- Seven Rings in Hand (song)
- Severed Chains
- Sewer Scrapes
- Sewer Search
- Sfactor
- Shade
- Shadow
- Shadow's Rebirth
- Shadow's Speed Demon
- Shadow, the Black Android
- Shadow Adventure
- Shadow Android
- Shadow Androids
- Shadow Basketball
- Shadow Canyons
- Shadow Generations
- Shadow Grinder
- Shadow Grinding
- Shadow Hockey
- Shadow Knows
- Shadow Rifle
- Shadow SET ID Table Editor