Midori (Japanese: 緑, lit. 'green') is a free and open-source web browser. In 2019, the Midori project was acquired by the Astian Foundation. After the acquisition, the project became a derivative of the Firefox browser.

Midori began as a lightweight web browser using the WebKitGTK rendering engine and the GTK widget toolkit. Midori was part of the Xfce desktop environment's Goodies collection of applications and followed the Xfce principle of "making the most out of available resources". It was the default browser in the SliTaz Linux distribution, Trisquel Mini, Artix Linux, old versions of Raspbian, and wattOS in its "R5 release". It was the default browser in elementary OS "Freya" and "Luna", and Bodhi Linux. Midori was part of the standard Raspbian distribution for the Raspberry Pi ARMv6-based computer, while Dillo and NetSurf are also in the menu.

Midori passed the standard compliance Acid3 test. In March 2014, Midori scored 405/555 on the HTML5 test. In July 2015, Midori 0.5 on Windows 8 scored 325/555 on the updated HTML5 test.

In June 2024, Astian's CEO announced Midori would launch their own open source VPN service. The VPN service became available in February 2025, though not yet integrated within the browser.

In March 2025, Astian released version 11.5.2, the first version to support macOS. It also announced plans for making Midori available on iPhone and iPad.

Midori featured:

The former Midori was recommended by Lifehacker due to its simplicity. The major points for criticism are the absence of process isolation, the low number of available extensions and occasional crashes.^{[citation needed]}

Nick Veitch from TechRadar included Midori 0.2.2 in his 2010 list of the eight best web browsers for Linux. At that time he rated it as "5/10" and concluded, "while it does perform reasonably well all-round, there is no compelling reason to choose this browser over the default Gnome browser, Epiphany, or indeed any of the bigger boys".