Telkomsel

PT Telekomunikasi Selular
	Logo used since 18 June 2021
	Telkom Landmark Complex Building in Jakarta, Indonesia
Trade name	Telkomsel
Company type	Joint venture
Industry	Telecommunications
Founded	26 May 1995
Headquarters	Telkom Landmark Complex, Jakarta, Indonesia
Key people	Diaz Hendropriyono (President Commissioner); Nugroho (President Director);
Brands	SIMPATI; Halo; Orbit; Telkomsel One; EZnet; by.U; IndiHome;
Services	Prepaid; Postpaid; Landline telephony; Wireless and fixed internet; SMS;
Owners	Telkom Indonesia (69.9%); Singtel (30.1%);
Website	www.telkomsel.com

PT Telekomunikasi Selular, trading as Telkomsel, is an Indonesian telecommunications company founded in 1995. Its ownership is divided between Telkom Indonesia (69.9%) and Singtel (30.1%), which serves as Telkom's consumer services arm starting 1 July 2023 by its management takeover of IndiHome. It is headquartered alongside Telkom in the Telkom Landmark Complex.

Telkomsel is the largest cellular telecommunication carrier in the country with 169.5 million customer base as of 2020. The company operates their GSM network on the 900–1800 MHz frequency range, as well as 3G, 4G, and 5G services on other frequencies. Telkomsel operates a variety of mobile services, chief among them are SIMPATI (previously Telkomsel PraBayar) and Telkomsel Halo (formerly kartuHalo). These brands differ on their payment model (prepaid vs. postpaid) as well as pricing. As of the first quarter of 2020, Telkomsel had a 66.4% share of the Indonesian mobile phone market.