Singapore Mandarin represents a distinct and dynamic variety shaped by local multilingualism and global influences. This comprehensive study offers the most up-to-date linguistic description of contemporary Singapore Mandarin, drawing on a decade's worth of natural spoken and written data. Through rigorous quantitative and qualitative analyses, it systematically examines the variety's distinctive lexical, grammatical, and discourse features, revealing it as an inclusive and evolving system. Expanding beyond Putonghua comparisons, the analysis incorporates perspectives from Taiwan, Hong Kong, and Malaysia Mandarin, offering a broader perspective on regional variations. A sociolinguistic survey of native speakers further enriches the study with insights into language attitudes, ideologies, and usage trends. By documenting how external sociocultural factors and internal innovations drive linguistic change, the book advances global understandings of Mandarin variation. As a significant contribution to Chinese linguistics, World Chineses, language contact, and multilingualism studies, this work is essential reading for linguists, educators, and policymakers.