Peter Gast may refer to:

• Peter Gast (chef), Dutch Michelin starred chef of 't Schulten Hues
• Heinrich Köselitz (1854–1918), author, friend of Friedrich Nietzsche, who gave him the pseudonym "Peter Gast"

• Sega Mark II
• Sega Master System
• Segambut Bypass
• Sega Mega-CD
• Sega Mega Drive and Genesis
• Sega Mega Drive / Sega Genesis
• Sega MegaModem
• Segametsi Mogomotsi
• Sega music
• Sega Naomi 2
• Sega Net
• Sega Networks
• SEGA Networks
• Sega Net Work System
• Seganfreddo
• Seganfredo
• Seganfredo (surname)
• Seganje
• Segantini
• Sega Nu
• Segaon, Madhya Pradesh
• Sega OutRun
• Sega Periscope
• Sega pinball
• Sega Pinball Inc.