Sir Haydn may refer to

• Sir Henry Haydn Jones (1863-1950) - Welsh politician
• Sir Haydn (locomotive) - a steam locomotive named after Sir Henry Haydn Jones.

• Fulgurating
• Fulguratio
• Fulhadhoo (Baa Atoll)
• Fulham Academy
• Fulham Baths
• Fulham Boys School
• Fulham Enterprise Studio
• Fulham F.C
• Fulham F.C. league record by opponent
• Fulham F.C. season 2011–12
• Fulham F.C. season 2012–13
• Fulham F.C. season 2013–14
• Fulham Fire Station
• Fulham Grange railway station, Melbourne
• Fulham High Street
• Fulham House
• Fulham Library
• Fulham Metropolitan Borough Council
• Fulham Park, Alberta
• Fulham Pottery
• Fulham RLFC
• Fulhams
• Fulham Symphony Orchestra
• Fulham Town Hall
• Fulham United FC