Chapter 8 examines the typologically rare three-way laryngeal contrast found in Korean. As also noted in Chapter 2, the manner contrasts in the Korean obstruent inventory have been the point of departure for many descriptive and theoretical contributions to the typology of laryngeal contrasts and related issues, such as feature theory. More recently, a diachronic change characterized by the redistribution of cue weights from the consonantal to the vocalic portion of the signal, mirroring the common historical process of tonogenesis, has sparked renewed interest in the Korean laryngeal contrasts. The opportunity to observe such a change in vivo, and to compare its progression across different dialects, provides an ideal testing ground for theories of sound change. This chapter provides a review of the literature on the phonetic and phonological characterizations of the stop-laryngeal contrast, as well as a survey of dialectal and diachronic variation in its phonetic realization. The chapter closes with an apparent-time study documenting dialectal variation and change in the use of three acoustic cues to the contrast (VOT, f0, and H1-H2) in three dialects of Korean.