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We present the serendipitous discovery of an L subdwarf, 2MASSJ06164006-6407194, in a search of the Two Micron All Sky Survey for T dwarfs.Its spectrum exhibits features indicative of both a cool and metal pooratmosphere including a heavily pressured-broadened K I resonant doublet, Cs Iand Rb I lines, molecular bands of CaH, TiO, CrH, FeH, and H2O, and enhancedcollision induced absorption of H2. We assign 2MASS 0616-6407 a spectral typeof sdL5 based on a comparison of its red optical spectrum to that of nearsolar-metallicity L dwarfs. Its high proper motion (mu =1.405+-0.008 arcsecyr-1), large radial velocity (Vrad = 454+-15 km s-1), estimated uvw velocities(94, -573, 125) km s-1 and Galactic orbit with an apogalacticon at ~29 kpc areindicative of membership in the outer halo making 2MASS 0616-6407 the firstultracool member of this population.

2MASS J06164006-6407194: The First Outer Halo L Subdwarf