Rovio Entertainment Oy (formerly Relude Oy and Rovio Mobile Oy) is a Finnish video game developer based in Espoo. Founded in 2003 by Helsinki University of Technology students Niklas Hed, Jarno Väkeväinen and Kim Dikert, the company is best known for the Angry Birds franchise. The company currently operates studios in Barcelona, Toronto, Espoo, Stockholm, and Copenhagen, with former offices in Montreal. The company's success has helped to establish Finland as a leading player in the mobile game industry and has helped to create a thriving ecosystem for game development in the country. In August 2023, Sega purchased Rovio for US$776 million and it was made a subsidiary of the Sega Europe division.

In 2003, three students from the Helsinki University of Technology, Niklas Hed, Jarno Väkeväinen and Kim Dikert, participated in a mobile game development competition at the Assembly demo party sponsored by Nokia and Hewlett-Packard. A victory with a mobile game called King of the Cabbage World led the trio to set up their own company, Relude. King of the Cabbage World was sold to Sumea, and renamed to Mole War, which became one of the first commercial real-time multiplayer mobile games. In January 2005, Relude received its first round of investment from a business angel, and the company changed its name to Rovio Mobile, where "rovio" translates from Finnish as "pyre".

In 2009, the board gave Mikael Hed the job of CEO. In December 2009, Rovio released Angry Birds, its 52nd game, a puzzle game where a bird is flung at pigs using a slingshot for the iPhone; it reached the No. 1 spot in the Apple App Store paid apps chart after six months, and remained charted for months after.

In March 2011, Rovio raised $42 million in venture capital funding from Accel Partners, Atomico and Felicis Ventures. In July 2011, the company changed its name to Rovio Entertainment. In June 2011, the company hired David Maisel to lead its Angry Birds movie production. By October 2011, Rovio purchased Kombo, a Helsinki-based animation company. The animation studio was acquired to produce a series of short videos released in 2012. In March 2012, Rovio acquired Futuremark Game Studios, the game development division of benchmarking company Futuremark, for an undisclosed sum.

In May 2012, Rovio announced that its game series Angry Birds had reached its one billionth download. In July 2012, Rovio announced a distribution partnership with Activision to bring the first three Angry Birds titles to video game consoles and handhelds, in a collection named Angry Birds Trilogy. It was released in September 2012. In November 2012, Rovio released Angry Birds Star Wars, an iteration of its popular game licensed from the Star Wars original trilogy, for mobile devices and PC. Rovio partnered with Activision again to port the title to video game consoles and handhelds, with it being released on those platforms in October 2013. A sequel, Angry Birds Star Wars II, based on the Star Wars prequel trilogy, was released in September 2013.

In March 2013, Rovio launched its multi-platform Toons.TV channel starting with Angry Birds Toons. As of 2013, Rovio became a video game publisher and is publishing third party games through its Rovio Stars program. The channel was discontinued in 2017.

In January 2014, Rovio announced that its game series Angry Birds had reached its two billionth download. In addition, it was revealed that its flagship series, Angry Birds, "leaked data" to third-party companies, possibly to surveillance agencies like the NSA. In retaliation, anti-NSA hackers defaced Rovio's website.

In May 2014, Rovio launched a new publishing arm, Rovio LVL11, to release experimental games. The first game published under Rovio LVL11 is Retry and the second is Selfie Slam. As of June 2014, Rovio considers themselves an entertainment company, not just a game company. This is reinforced by Rovio's merchandise and licensing business accounting for about half of its annual revenue of $216 million in 2013.