Alan Sinclair may refer to:

• Alan Sinclair (rower) (born 1985), British rower
• Alan Sinclair (footballer) (1900–1972), Australian rules footballer
• Alan Sinclair (scientist) (born 1952), clinical scientist and diabetes specialist

• Peak Sport
• Peak Sport Product
• Peak Sport Products
• Peaks, Valleys, Honky Tonks & Alleys
• Peak thorium
• Peak time
• Peak to peak charter school
• Peak (topography)
• Peak (typography)
• Peak uranium
• Peak Valley Parkway
• Peak value
• Peak water
• Peak wheat
• Peak Wilderness sanctuary
• Peak Wilderness sanctuary (Sri Lanka)
• Peak Wildlife Park
• Peak zone
• Peal de becerro
• Peal de Becerro, Jaen
• Peale Inlet
• Peale, Pennsylvania
• Peale's Barber Farm Mastodon Exhumation Site
• Peale's Dolphin
• Peale's Imperial-pigeon