Pentapeptide may refer to:

• An oligopeptide formed from five amino acids
• Pentapeptide repeat

• Double (disambiguation)
• Double disc grinding
• DOUBLE discography
• Double discography
• Double disc (Pictish symbol)
• Double-displacement
• Double-displacement reactions
• Double diversion
• Doubledogdare
• Doubledogdare Stakes
• Double domain
• Double Dose (Hot Tuna album)
• Double Dose (Tela album)
• Double-dot
• Double dot (diacritic)
• Double-dots
• Double dots
• Double dotted note
• Double dotted notes
• Double-dotted notes
• Double-dotting
• Doubledotting
• Double-Double
• Doubledouble
• Double double boy in trouble