Theme Building, a landmark building in the Los Angeles International Airport
Theme music a piece often written specifically for a radio program, television program, video game, or film, and usually played during the intro, opening credits, or ending credits
Theme vowel or thematic vowel, a vowel placed before the word ending in certain Proto-Indo-European words
Subject (music), sometimes called theme, a musical idea, usually a recognizable melody, upon which part or all of a composition is based