Jacobsen may refer to:
- Jacobsen (surname), people with the surname Jacobsen
In places:
- Jacobsen, California, in El Dorado County
- Jacobsen Bight, South Georgia
In other uses:
- Jacobsen, a brand of lawn-care products owned by conglomerate Textron
- Jacobsen (beer)
- H. N. Jacobsens Bókahandil, bookshop in Tórshavn and Faroe
- Jacobsen rearrangement, chemical reaction
- Jacobsen syndrome, congenital disorder
- Theodore Jacobsen Observatory, University of Washington, U.S.
- Jacobsen v. Katzer, a lawsuit relevant to intellectual property law
- Jacobsen Elektro, an independent power producer, headquartered in Norway