A composer is someone, or something that composes a cohesive result by putting together two or more things, elements, or parts to form a whole. A composer typically refers to a person who creates or writes music.

• Composer (album), a 1996 album by Cedar Walton
• "The Composer", a 1969 song by Diana Ross & the Supremes from the album Let the Sunshine In
• Rubato Composer, software that composes music

• Composer (software), a dependency manager for the PHP programming language
• Mozilla Composer, a component of the Mozilla Web browser
• Netscape Composer, a WYSIWYG HTML editor

• Composer (role variant)
• Chess composer

• Compose key
• All pages with titles beginning with Composer