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CHIMERA (CaltecH Inverse ModEling and Retrieval Algorithms) retrieves exoplanet atmospheres, and can be used for both transmission and emission geometries with options for both the "free" and "chemically consistent" abundance retrievals. The code uses correlated-K opacities (R=100) with the random-overlap resort-rebin procedure and includes full multiple scattering in emission (both planetary and stellar reflected light) using a two stream approximation variant. CHIMERA includes multiple Bayesian samplers, including PyMultiNest (ascl:1606.005) and dynesty (ascl:1809.013).