The last decade has seen a rise in popularity in construction-based approaches to grammar. Put simply, the various approaches within the rubric 'construction grammar' all see grammar (morphemes, words, idioms, etc.) as fundamentally constructions -- pairings of form and meaning. This is distinct from formal syntax which sees grammar as a system of atomized units governed by formal rules. Construction Grammar is connected to cognitive linguistics and shares many of its philosophical and methodological assumptions. Advocates of Construction Grammar see it as a psychologically-plausible, generative theory of human language that can also account for all kinds of linguistic data. The research programs it has spawned range from theoretical morphological and syntactic studies to multidisciplinary cognitive studies in psycho-, neuro-, and computational linguistics. This Handbook is the first authoritative reference work solely dedicated to the theory, method, and applications of Construction Grammar, and will be a resource that students and scholars alike can turn to for a representative overview of its many sub-theories and applications. It has 24 chapters divided into 7 sections, with an introduction covering the theory's basic principles and its relationship with other theories including Chomskyan syntax. The book's readership lies in a variety of diverse fields, including corpus linguistics, thoeretical syntax, psycho and neurolinguistics, language variation, acquisition, and computational linguistics.