Sipakapense is a (K'ichean) Mayan language spoken in and around the municipio of Sipacapa in the San Marcos Department of western Guatemala. Unlike other K'ichean languages, Sipakapense allows for sequences of up to six word-initial consonants. Sipakapense is an ergative language with primarily VSO word order and several voices, including two distinct passives and two distinct antipassives. This grammar describes the primary features of Sipakapense phonology, morphology, and syntax