Tizen (/ˈtaɪzɛn/) is a Linux-based operating system primarily developed by Samsung Electronics and supported by the Linux Foundation.

Samsung merged its previous Linux-based OS effort, Bada, into Tizen and has since used it primarily on platforms such as wearable devices and smart TVs.

In May 2021, Google announced that Samsung would partner with the company on integrating Tizen features into Google's Android-derived Wear OS and committed to using it on future wearables, leaving Tizen to be mainly developed for Samsung Smart TVs.

In 2011, after Nokia abandoned the project, Linux Foundation initiated the Tizen project as a successor to MeeGo, another Linux-based mobile operating system, with its main backer Intel joining Samsung Electronics, as well as Access Co., NEC Casio, NTT DoCoMo, Panasonic Mobile, SK Telecom, Telefónica, and Vodafone as commercial partners.

Tizen would be designed to use HTML5 apps, and target mobile and embedded platforms such as netbooks, smartphones, tablets, smart TVs, and in-car entertainment systems.

[5] On September 16, 2012, Automotive Grade Linux announced its intent to use Tizen as the basis of its reference distribution.

[66] In December 2016, Samsung created TizenRT,[67] a fork of NuttX, a real-time operating system (RTOS), for smart home appliances and IoT devices.