This research paper explores the morphophonemic variations of the morpheme {N} in the Javanese language, a member of the Austronesian language family. The study aims to comprehensively analyze the various phonological and morphological processes that affect the realization of the {N} morpheme in different linguistic contexts. The research employs a descriptive approach based on analyzing data collected from both primary and secondary sources. This study aims to examine the morphophonemics of the morphemes N- + RW, N- + RW + -ake, and N- + RW + -i, as well as their productivity and underlying principles. Observation, document analysis, and interviews were employed as data-gathering methods. Among the observation and document procedures utilized for data gathering was the observation of written and spoken Javanese materials. The data gathering additionally included interviews with three native Javanese speakers and Javanese language specialists to cross-reference the word forms employed. The researcher used a data triangulation methodology to validate the data. The technique for data analysis included an interactive analytical model that provides for data collection, display, condensation, and conclusion. The morphophonemics of the Javanese morphemes N- + RW, N- + RW + -ake, and N-+ RW + -i involve assimilation, ellipsis, synthesis, and phoneme addition, according to the findings of this study. The assimilation process results in the creation of allomorphs of the morpheme N-, particularly m-, n-, ny-, ng- , and -. As shown in Table 5, the morphophonemic principles of the morpheme N- + RW can be formed. In general, the productivity of the morphemes N- + RW, N- + RW + -ake, and N- + RW + -i is high. Unproductivity of these morphemes happens when the morpheme N- meets an RW with a nasal-sounding starting phoneme.