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We present wide field JHKs photometry of 16 Galactic globular clusterslocated towards the Galactic bulge, calibrated on the 2MASS photometric system.Differential reddening corrections and statistical field star decontaminationare employed for all of these clusters before fitting fiducial sequences to thecluster red giant branches (RGBs). Observed values and uncertainties arereported for several photometric features, including the magnitude of the RGBbump, tip, the horizontal branch (HB) and the slope of the upper RGB. Thelatest spectroscopically determined chemical abundances are used to builddistance- and reddening-independent relations between observed photometricfeatures and cluster metallicity, optimizing the sample size and metallicitybaseline of these relations by supplementing our sample with results from theliterature. We find that the magnitude different between the HB and the RGBbump can be used to predict metallicities, in terms of both iron abundance[Fe/H] and global metallicity [M/H], with a precision of better than 0.1 dex inall three near-IR bandpasses for relative metal-rich ([M/H]$\gtrsim$-1)clusters. Meanwhile, both the slope of the upper RGB and the magnitudedifference between the RGB tip and bump are useful metallicity indicators overthe entire sampled metallicity range (-2$\lesssim$[M/H]$\lesssim$0) with aprecision of 0.2 dex or better, despite model predictions that the RGB slopemay become unreliable at high (near-solar) metallicities. Our results agreewith previous calibrations in light of the relevant uncertainties, and wediscuss implications for clusters with controversial metallicities as well asdirections for further investigation.

Near-Infrared Photometry of Globular Clusters Towards the Galactic Bulge: Observations and Photometric Metallicity Indicators