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<jats:title>ABSTRACT</jats:title> <jats:p>We report the discovery of a bright (<jats:italic>f</jats:italic>(250 μm)&gt;400 mJy), multiply lensed submillimeter galaxy HERMES J105751.1+573027 in <jats:italic>Herschel</jats:italic>/SPIRE Science Demonstration Phase data from the HerMES project. Interferometric 880 μm Submillimeter Array observations resolve at least four images with a large separation of ∼9″. A high-resolution adaptive optics <jats:italic>K<jats:sub>p</jats:sub> </jats:italic> image with Keck/NIRC2 clearly shows strong lensing arcs. Follow-up spectroscopy gives a redshift of <jats:italic>z</jats:italic> = 2.9575, and the lensing model gives a total magnification of μ ∼ 11 ± 1. The large image separation allows us to study the multi-wavelength spectral energy distribution (SED) of the lensed source unobscured by the central lensing mass. The far-IR/millimeter-wave SED is well described by a modified blackbody fit with an unusually warm dust temperature, 88 ± 3 K. We derive a lensing-corrected total IR luminosity of (1.43 ± 0.09) × 10<jats:sup>13</jats:sup>  <jats:italic>L</jats:italic> <jats:sub>☉</jats:sub>, implying a star formation rate of ∼2500 <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub> yr<jats:sup>−1</jats:sup>. However, models primarily developed from brighter galaxies selected at longer wavelengths are a poor fit to the full optical-to-millimeter SED. A number of other strongly lensed systems have already been discovered in early <jats:italic>Herschel</jats:italic> data, and many more are expected as additional data are collected.</jats:p>