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The iPhone 3GS, originally the iPhone 3G S, retroactively re-stylized the iPhone 3Gs, is a touchscreen smartphone, designed and marketed by Apple Inc. It is the third generation iPhone, successor to the iPhone 3G. It was introduced on June 8, 2009, at the WWDC 2009 which took place at the Moscone Center, San Francisco. The "S" was later added to facilitate faster phone as "Speed".

Improvements include performance, a 3.2-megapixel camera with higher resolution and video ability, voice control, and support for 7.2 Mbit/s HSDPA downloading (but remains limited to ​384 kbps​ uploading as Apple had not implemented the HSUPA protocol). It was released in the U.S., Canada and six European countries on June 19, 2009, in Australia and Japan on June 26, and internationally in July and August 2009.

The iPhone 3GS runs Apple's iOS operating system, as is used on the iPad and iPod touch. It is controlled mostly by a user's fingertips on a multi-touch display. It was succeeded as Apple's flagship smartphone in 2010 by the iPhone 4; however, the 3GS continued in production until September 2012 when the iPhone 5 was announced.