  We present a measurement of the polarization of Antilambda hyperons produced
in nu_mu charged current interactions. The full data sample from the NOMAD
experiment has been analyzed using the same V0 identification procedure and
analysis method reported in a previous paper for the case of Lambda hyperons.
The Antilambda polarization has been measured for the first time in a neutrino
experiment. The polarization vector is found to be compatible with zero.
