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The microlaser has important applications to integrated photonic circuits. Over the past decade, several types of microlasers have been developed. The key issue of the microlaser is to confine light in a small volume with dimensions on the order of the optical wavelength. In the vertical-cavity surface-emitting laser, light is confined by two distributed Bragg reflectors. 1 The microdisk laser utilizes total internal reflection at the edge of a high-index disk to form whispering gallery modes. 2 In a recent work of a two-dimensional photonic band-gap defect-mode laser, the lateral confinement of light is achieved by Bragg scattering in a two-dimensional periodic structure. 3 The fabrication of these microlasers requires expensive state-of-the-art crystal growth and microfabrication facilities. In this letter, we demonstrate a type of microlaser made of disordered medium. The physical mechanism of optical confinement is based on …