A device used to trap microscopic entities, such as atoms, using magnetic fields. There are several different types of magnetic trap. In the case of static magnetic traps, such as the Ioffe–Pritchard trap, there is a central point O where the magnetic field is at its minimum value. If the magnetic moment of the atom is antiparallel to the magnetic field then the atom is said to be a low-field seeker, with there being a force towards O. If the magnetic moment of the atom is parallel to the magnetic field then it is said to be a high-field seeker. Stable magnetic traps cannot be used for high-field seekers.

Although magnetic traps cannot confine atoms at room temperature, laser cooling has made their use viable. Magnetic traps have been used to bring about Bose–Einstein condensation. See also ion trap.