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NonVisual Desktop Access (NVDA) is a free and open-source, portable screen reader for Microsoft Windows.

This Screen readers enable people with blindness, visual impairments, and/or reading disabilities to use computers and browse websites by reading out loud the text and alternative text on the screen. Users can control what NVDA reads by using their keyboard and/or mouse. If stored on a USB flash drive, NVDA can run on any Windows computer without installing or requiring administrative privileges. Besides general Windows functionality, NVDA works with software such as Microsoft office applications, WordPad, Notepad, Windows Media Player, web browsers such as Mozilla Firefox, Google Chrome, Internet Explorer, and Microsoft Edge. It supports most email clients such as Outlook, Mozilla Thunderbird, and Outlook Express. NVDA also works with most functions of Microsoft Word, Microsoft PowerPoint and Microsoft Excel.

In 2021 the screen reader user survey by WebAIM found NVDA to be the second-most popular screen reader worldwide, having previously assumed the number one position in their 2019 survey.