Msun may refer to:

• FreeBSD's implementation of the C mathematical functions (based on Sun Mycrosystem's FDLIBM)
• Solar mass — {{Solar mass}}

• Breakfast in the Field
• Breakfast In The Field
• Breakfast in the field
• Breakfast in the ruins
• Breakfast Machine
• Breakfast martini
• Breakfast muffin
• Breakfast (New Zealand Television Programme)
• Breakfast (New Zealand TV program)
• Breakfast of champions
• Breakfast on the Morning Tram
• Breakfast On The Morning Tram
• Breakfast Serials
• Breakfast (TV show)
• Breakfast with amy
• Breakfast with Amy
• Breakfast with frost
• Breakfast with girls
• Breakfast with hunter
• Breakfast with Les and Bess
• Breakfast with scot
• Breakfast with the arts
• Breakfast with the beatles
• Breakfest
• Break (film)