text: mars magnetic field? dose mars have a magnetic fleld? how many planets have magnetic fields? (i know earth jupiter and so and so has them.) it does, although it is pretty weak.  the magnetic field depends on the rotation of the planet's metal core.  that's what creates the field.   the other planets with magnetic fields include: mercury, venus, jupiter, saturn, uranus, and neptune.  if a planet doesn't have a rotating core of metal, it will not have a magnetic field, such as pluto.