  This white paper examines the benefit of the upcoming James Webb Space
Telescope for studies of the Solar System's four giant planets: Jupiter,
Saturn, Uranus, and Neptune. JWST's superior sensitivity, combined with high
spatial and spectral resolution, will enable near- and mid-infrared imaging and
spectroscopy of these objects with unprecedented quality. In this paper we
discuss some of the myriad scientific investigations possible with JWST
regarding the giant planets. This discussion is preceded by the specifics of
JWST instrumentation most relevant to giant planet observations. We conclude
with identification of desired pre-launch testing and operational aspects of
JWST that would greatly benefit future studies of the giant planets.
