Chromebook (stylized in all-lowercase) is a line of laptops, desktops, tablets and all-in-one computers that run ChromeOS, a proprietary operating system developed by Google.

Chromebooks are optimised for web access. They also run Android apps, Linux applications, and progressive web apps which do not require an Internet connection. They are manufactured and offered by various OEMs.

The first Chromebooks were shipped on June 15, 2011. As of 2020, Chromebook's market share is 10.8%, placing it above the Mac platform; it has mainly found success in education markets.

Since 2021, all Chromebooks receive 10 years of regular automatic updates with security patches from Google; previously, Chromebooks received 8 years of updates. Chromebooks can be repurposed with other operating systems and/or used for other purposes if required.

The first Chromebooks for sale, by Acer Inc. and Samsung, were announced at the Google I/O conference on May 11, 2011 and began shipping on June 15, 2011. Lenovo, Hewlett-Packard (now HP Inc.) and Google itself entered the market in early 2013. In December 2013, Samsung launched a Samsung Chromebook specifically for the Indian market that employed the company's Exynos 5 Dual core processor.

Critical reaction to the device was initially skeptical, with some reviewers, such as then New York Times technology columnist David Pogue, unfavorably comparing the value proposition of Chromebooks with that of more fully featured laptops running the Microsoft Windows operating system. That complaint dissipated later in reviews of machines from Acer and Samsung that were priced lower.

In February 2013, Google announced and began shipping the Chromebook Pixel, a higher-spec machine with a high-end retail price.

In January 2015, Acer announced the first big screen Chromebook, the Acer Chromebook 15 with an FHD 15.6-inch display.