| FM | First Mold | In English | |
| FM | Flight Model | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| FM | Fluid Module | In English | |
| FM | Fracture Mechanics | In English | → Physics |
| FM | Frequency Modulated | In English | → Telecommunications |
| FM | Frequency Modulation | In English | → Telecommunications |
| FM | Federación Minerometalúrgica | In Spanish | → Organizations and associations → Labour, labour economics → Metallurgy |
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