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We examine the inner mass distribution of the relaxed galaxy cluster Abell383 in deep 16-band HST/ACS+WFC3 imaging taken as part of the CLASH multi-cycletreasury program. Our program is designed to study the dark matter distributionin 25 massive clusters, and balances depth with a wide wavelength coverage tobetter identify lensed systems and generate precise photometric redshifts. Thisinformation together with the predictive strength of our strong-lensinganalysis method identifies 13 new multiply-lensed images and candidates, sothat a total of 27 multiple-images of 9 systems are used to tightly constrainthe inner mass profile, $d\log \Sigma/d\log r\simeq -0.6\pm 0.1$ (r<160 kpc).We find consistency with the standard distance-redshift relation for the fullrange spanned by the lensed images, 1.01<z<6.03, with the higher redshiftsources deflected through larger angles as expected. The inner mass profilederived here is consistent with the results of our independent weak-lensinganalysis of wide-field Subaru images, with good agreement in the region ofoverlap. The overall mass profile is well fitted by an NFW profile withM_{vir}=(5.37^{+0.70}_{-0.63}\pm 0.26) x 10^{14}M_{\odot}/h and a relativelyhigh concentration, c_{vir}=8.77^{+0.44}_{-0.42}\pm 0.23, which lies above thestandard c-M relation similar to other well-studied clusters. The criticalradius of Abell 383 is modest by the standards of other lensing clusters,r_{E}\simeq16\pm2\arcsec (for z_s=2.55), so the relatively large number oflensed images uncovered here with precise photometric redshifts validates ourimaging strategy for the CLASH survey. In total we aim to provide similarlyhigh-quality lensing data for 25 clusters, 20 of which are X-ray selectedrelaxed clusters, enabling a precise determination of the representative massprofile free from lensing bias. (ABRIDGED)

The Cluster Lensing and Supernova Survey with Hubble (CLASH): Strong Lensing Analysis of Abell 383 from 16-Band HST WFC3/ACS Imaging