Mobistar ( ) is one of Belgium's three mobile telecommunications operators. It competes with Proximus, owned by Belgacom, and BASE, a subsidiary of the former Dutch PTT, KPN.

Mobistar is majority-owned by France Télécom's mobile division Orange, which holds a 50.17% stake. It was founded as a joint venture between Telinfo and France Telecom Mobile International in 1996, building a GSM900 network and then founding a complementary DCS1800 network. Initially Mobistar added to its network coverage by signing contracts with providers such as Motorola & Talkline, Cellway (Martin Dawes Telecommunications) and Debitel Belgium (the latter two which it would take over respectively in 1997 and 2000).

Mobistar claims to have been the first GPRS operator in Belgium.