SFAI may refer to:

• Santa Fe Associates International
• SFAI Santa Fe Associates International
• San Francisco Art Institute
• Società per le strade ferrate dell'Alta Italia, Upper Italian Railways

• Affiliate revenue model
• Affiliate station
• Affiliate tracking software
• Affiliating universities
• Affiliation
• Affiliation (disambiguation)
• Affiliation Quebec
• Affilin
• Affilliate
• Affin.
• Affinage
• Affinaged
• Affine algebra (disambiguation)
• Affine approximation
• Affine arclength
• Affine basis
• Affine cone
• Affined
• Affine deformation
• Affine (disambiguation)
• Affine focal set
• Affine frame
• Affine general linear group
• Affine geometry of curves
• Affine Grassmannian