FSY may refer to:

• Footscray railway station, in Victoria, Australia
• Forsys Metals, a Canadian mining company

• List of nicknames for George W. Bush
• List of nicknames of British Army regiments
• List of nicknames of European royalty and nobility
• List of nicknames of Presidents of the United States
• List of nicknames used by George W. Bush
• List of Nigerian poets
• List of Nigerian Presidents
• List of Nigerians
• List of Nigerian states
• List of Nigerian traditional states
• List of Nigerien
• List of Nigeriens
• List of night markets in Taiwan
• List of Nikola Tesla patents
• List of Nikoli puzzle types
• List of Nikon Products
• List of Nikon products
• List of Ninja Scroll: The Series characters
• List of Nintendo 64 games
• List of Nintendo development divisions
• List of Nintendo DS Games
• List of Nintendo DS games
• List of Nintendo DS online games
• List of Nintendo DS Wi-Fi Connection games
• List of Nintendo Entertainment System accessories