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The most distant galaxies known are at z~10-11, observed 400-500 Myr afterthe Big Bang. The few z~10-11 candidates discovered to date have beenexceptionally small- barely resolved, if at all, by the Hubble Space Telescope.Here we present the discovery of SPT0615-JD, a fortuitous z~10(z_phot=9.9+/-0.6) galaxy candidate stretched into an arc over ~2.5" by theeffects of strong gravitational lensing. Discovered in the Reionization LensingCluster Survey (RELICS) Hubble Treasury program and companion S-RELICS Spitzerprogram, this candidate has a lensed H-band magnitude of 25.7+/-0.1 AB mag.With a magnification of \mu~4-7 estimated from our lens models, the de-lensedintrinsic magnitude is 27.6+/-0.3 AB mag, and the half-light radius is r_e<0.8kpc, both consistent with other z>9 candidates. The inferred stellar mass (log[M* /M_Sun]=9.7^{+0.7}_{-0.5}) and star formation rate (\log [SFR/M_Sunyr^{-1}]=1.3^{+0.2}_{-0.3}) indicate that this candidate is a typicalstar-forming galaxy on the z>6 SFR-M* relation. We note that three independentlens models predict two counterimages, at least one of which should be of asimilar magnitude to the arc, but these counterimages are not yet detected.Counterimages would not be expected if the arc were at lower redshift. However,the only spectral energy distributions capable of fitting the Hubble andSpitzer photometry well at lower redshifts require unphysical combinations ofz~2 galaxy properties. The unprecedented lensed size of this z~10 candidateoffers the potential for the James Webb Space Telescope to study the geometricand kinematic properties of a galaxy observed 500 Myr after the Big Bang.

A Candidate $z\sim10$ Galaxy Strongly Lensed into a Spatially Resolved Arc