We report the detection of strong absorption and weak emission features in the 4-27 mum Spitzer Infrared Spectrograph (IRS) spectrum of the distant ultraluminous infrared galaxy IRAS F00183-7111 (z = 0.327). The absorption features of CO2 and CO gas, water ice, hydrocarbons, and silicates are indicative of a strongly obscured (A(9.6) greater than or equal to 5.4; A(V) greater than or equal to 90) and complex line of sight through both the hot diffuse interstellar medium and shielded cold molecular clouds toward the nuclear power source. From the profile of the 4.67 mum CO fundamental vibration mode, we deduce that the absorbing gas is dense (n similar to 10(6) cm(-3)) and warm ( 720 K) and has a CO column density of similar to10(19.5) cm(-2), equivalent to N-H similar to 10(23.5) cm(-2). The high temperature and density, as well as the small inferred size (
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