奏鸣曲式是一种曲式，自古典时期以来开始广泛使用，一般用于奏鸣曲、交响曲、协奏曲等多乐章体裁的第一乐章。

奏鸣曲式分为呈示部，发展部(又称为展开部)和再现部。

包括主部、连接段、副部及小结尾。古典奏鸣曲式要求主部与副部之间保持严格的调性关系，即副部出现在主部的属调上，而贝多芬后期的作品呈示部中出现三度关系的主部和副部，浪漫主义作品甚至有二度关系的。一般来说，主部和副部的乐思往往是对比并置的或者是对比冲突的，这种并置或者冲突构成了奏鸣曲式的主要结构力量。主部和副部的主题是后面发展部发展的主要素材。早期奏鸣曲一般会要求演奏时呈示部反复一遍。协奏曲使用奏鸣曲式的时候，一般采用双呈示部，在第一个呈示部由乐队演奏，而第二个呈示部则由独奏乐器和乐队共同演奏。

Sonata form (also sonata-allegro form or first movement form) is a large-scale musical structure used widely since the middle of the 18th century (the early Classical period).

While it is typically used in the first movement of multi-movement pieces, it is sometimes used in subsequent movements as well—particularly the final movement. The teaching of sonata form in music theory rests on a standard definition and a series of hypotheses about the underlying reasons for the durability and variety of the form—a definition that arose in the second quarter of the 19th century. There is little disagreement that on the largest level, the form consists of three main sections: an exposition, a development, and a recapitulation; however, beneath this, sonata form is difficult to pin down in a single model.