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The period - metallicity - WISE W1- and W2-band luminosity relations arederived for RR Lyrae stars based on WISE epoch photometry for 360 and 275 starsin 15 and 9 Galactic globular clusters, respectively. Our final relations havethe form <MW1> = gamma(W1) - (2.381 +/- 0.097) log PF + (0.096 +/- 0.021)[Fe/H]and <MW2> = gamma(W2)-(2.269 +/- 0.127)log PF + (0.108 +/- 0.021)[Fe/H], where[Fe/H] values are on the scale of Carretta et al. (2009). We obtained twoappreciably discrepant estimates for the zero points gamma(W1) and gamma(W2) ofboth relations: one based on a statistical-parallax analysis -- gamma(W1) =-0.829 +/- 0.093 and gamma(W2)=-0.776 +/- 0.093 and another, significantlybrighter one, based on HST FGS trigonometric parallaxes -- gamma(W1, HST)=-1.150 +/- 0.077 and gamma(W2, HST) =-1.105 +/- 0.077. Theperiod-metallicity-luminosity relations in the two bands yield highlyconsistent distance moduli for the calibrator clusters and the distance modulicomputed using the W1- and W2-band relations with the HST zero points agreewell with those computed by \citet{sollima} based on their derivedperiod-metallicity-K-band luminosity relation whose zero point is tied to theHST trigonometric parallax of RR Lyrae itself (Delta DM0 = +0.04 and +0.06,respectively, with a scatter of only 0.06).

Mid-infrared PL relations for Globular Cluster RR Lyrae