高级服装定制指的是在时装界中，由专属的时装设计师为穿戴者量身定制时装的服务，简称“高定”。进行高级服装定制的奢侈品牌通常设有专门的工作室，被称为« maisons de haute couture »。这些工作室大都拥有悠久的历史，并由合作多年的设计师组成。工作室的作品往往能成为左右一季风潮的时尚风向标。

高级服装定制起源于法国，其法文名« haute couture »已经成为世界通用的专有名词，受到司法保护。成为一家高级服装定制工作室必须满足严格的标准，其中包括：作品都需要纯手工制作，原材料需要通过精心挑选，一定数量的成品需要在时装秀上展出等等。

Haute couture (/ˌoʊt kuːˈtjʊər/; French pronunciation: ​[ot kuˈtyʁ]; French for "high sewing" or "high dressmaking" or "high fashion") refers to the creation of exclusive custom-fitted clothing. Haute couture is high end fashion that is constructed by hand from start to finish, made from high quality, expensive, often unusual fabric and sewn with extreme attention to detail and finished by the most experienced and capable sewers, often using time-consuming, hand-executed techniques. Couture translates literally from French as "dressmaking" but may also refer to fashion, sewing, or needlework and is also used as a common abbreviation of haute couture and refers to the same thing in spirit. Haute translates literally to "high". A haute couture garment is often made for a client, tailored specifically for the wearer’s measurements and body stance. Considering the amount of time, money, and skill allotted to each completed piece, haute couture garments are also described as having no price tag: budget is not relevant.