Täby is a trimunicipal locality and the seat of Täby Municipality in Stockholm County, Sweden, with 66,292 inhabitants in 2013. It is also partly located in Danderyd Municipality (the Enebyberg area) and a very small part of Sollentuna Municipality. However, Täby kyrkby in the northern part of Täby Municipality forms part of the Vallentuna urban area.
Täby consists of the following districts: Arninge, Ella Gård, Hacksta, Ella Park, Enebyberg, Ensta, Erikslund, Gribbylund, Hägernäs, Lahäll, Löttingelund, Lövbrunna, Näsbypark, Roslags Näsby, Skarpäng, Täby Centrum, Viggbyholm, Vallatorp, and Visinge.
Täby is famous for its racecourse, which is called „Täby Galopp“. The course opened in 1960 and it replaced the earlier course Ulriksdal in Solna. The Center of Täby is called „Täby centrum“, and it is one of the largest malls in Sweden.
European route E18 and Norrortsleden pass through Täby, as does the urban railway Roslagsbanan.