Abstract Given the historical and linguistic contexts of Singapore, it is both theoretically and practically significant to study Singapore Mandarin (SM), an important member of Global Chinese. This paper aims to present a relatively comprehensive linguistic picture of SM by overviewing current studies, particularly on the variations that distinguish SM from other Mandarin varieties, and to serve as a reference for future studies on SM. This paper notes that (a) current studies have often provided general descriptions of the variations, but less on individual variations that may lead to more theoretical discussions; (b) the studies on SM are primarily based on comparisons with Mainland China Mandarin; (c) language contact has been taken as the major contributor of the variation in SM, whereas other factors are often neglected; and (d) corpora with SM data are comparatively less developed and the evaluation of data has remained largely in descriptive statistics.