Telenet Group N.V. is the largest provider of cable broadband services in Belgium. Its business comprises the provision of analog and digital cable television, fixed and mobile telephone services, primarily to residential customers in Flanders and Brussels. In addition, Telenet offers services to business customers all across Belgium and in Luxembourg under its brand Telenet Solutions.

Telenet was purchased in 2000 by Dick Callahan's telecommunications holding company, Callahan Associates International, in a deal valued at $969 million at the time.

Since 11 October 2005, Telenet was listed on the Euronext Brussels stock exchange under the ticker TNET, until it was acquired by Liberty Global on October 16 2023.

Telenet has offered its residential service since 1997 under the brand name Telenet Internet through the combination of its broadband cable network, which passes some 2.4 million homes in Flanders and a part of the Brussels region. All of the networks through which Telenet offers residential services in Flanders have been upgraded to a two way digital hybrid fibre-coaxial (HFC) standard, and Telenet has direct relationships with all of its Internet and telephony customers.

Its main competitors on the cable broadband Internet market are Numericable and VOO in the Brussels region, and Proximus, the leader of the Belgian DSL market in the Flanders and Brussels regions.

Telenet also offers voice, data and Internet services to its business customers under the brand name Telenet Solutions through its optical fiber backbone, by its acquisition of Codenet, which covers all of Belgium and Luxembourg.

Through its acquisition of Sinfilo, Telenet acquired a large network of Wi-Fi hotspots in addition to its cable Internet service.

In December 2016, Telenet submitted a proposal for the acquisition of SFR Belux from Altice, which has been authorized on 20 June 2017. This acquisition allowed Telenet to enter in the Wallon market and a serious presence in the Francophone market.