In medicine

• Macrophage migration inhibitory factor, a protein believed to be involved in immune response.
• Müllerian inhibiting factor, a hormone that plays a role in the sexual differentiation of humans

Other

• Masters in Finance
• FrameMaker Interchange Format
• Management Information Format
• MapInfo Interchange Format
• Merchant Inventory Financing
• HL7 Model Interchange Format
• Maximal intersecting family
• Multinational Interim Force
• Manchester International Festival, an arts festival held in Manchester, UK.
• Multilateral Investment Fund
• Music Interest Floor, a special interest floor at the University of Rochester
• Management Ignited Fires, fires intentionally started by agency personnel and permitted to burn