WAdvanced Satellite for Cosmology and Astrophysics
WAkari (satellite)
WArase (satellite)
WEarthCARE
WETS-VII
WGeotail
WGlobal Precipitation Measurement
WHakucho
WHALCA
WHinode (satellite)
WHisaki (satellite)
WHitomi (satellite)
WJCSAT-16
WOhsumi (satellite)
WOREX
WSpace Flyer Unit
WSuzaku (satellite)
WTenma
WTropical Rainfall Measuring Mission
WTSUBAME (satellite)
WWINDS
WYohkoh