The Nintendo 3DS is a handheld game console produced by Nintendo. It is capable of displaying stereoscopic 3D effects without the use of 3D glasses or additional accessories. Nintendo announced the console in March 2010 and officially unveiled it at E3 2010 on June 15. The console succeeds the Nintendo DS, featuring backward compatibility with older Nintendo DS video games. Its primary competitor was Sony's PlayStation Vita.

The handheld offers new features such as the StreetPass and SpotPass tag modes, powered by Nintendo Network; augmented reality, using its 3D cameras; and Virtual Console, which allows owners to download and play games originally released on older video game systems. It is also pre-loaded with various applications including an online distribution store called Nintendo eShop; a social networking service called Miiverse (shut down in 2017); an Internet Browser; the Netflix, Hulu Plus and YouTube streaming video services; Nintendo Video; a messaging application called Swapnote (known as Nintendo Letter Box in Europe and Australia); and Mii Maker.

The Nintendo 3DS was released in Japan on February 26, 2011, and worldwide beginning in March 2011. Less than six months later on July 28, 2011, Nintendo announced a significant price reduction from US$249 to US$169 amid disappointing launch sales. The company offered ten free Nintendo Entertainment System games and ten free Game Boy Advance games from the Nintendo eShop to consumers who bought the system at the original launch price. This strategy was considered a major success, and the console went on to become one of Nintendo's most successful handheld consoles in the first two years of its release. As of December 31, 2019, the Nintendo 3DS family of systems combined have sold 75.71 million units.

The 3DS received multiple redesigns over the course of its life. The Nintendo 3DS XL, a larger model, was first released in Japan and Europe in July 2012, featuring a 90% larger screen. An "entry-level" version of the console, the Nintendo 2DS, with a fixed "slate" form factor and lacking autostereoscopic (3D) functionality, was released in Western markets in October 2013. The New Nintendo 3DS features a more powerful CPU, a second analog stick called the C-Stick, additional buttons, an improved camera, and other changes, and was first released in Japan in October 2014.

As of 2019, the 3DS XL, New 3DS, New 3DS XL and 2DS models have ended production in Japan.