Shenzhou 6 (Chinese: 神舟六号) was the second human spaceflight of the Chinese space program. The Shenzhou spacecraft carried a crew of Fèi Jùnlóng (费俊龙) and Niè Haishèng (聂海胜) for five days in low Earth orbit. It launched three days before the second anniversary of China's first human spaceflight, Shenzhou 5.

The crew was able to change out of their new lighter space suits, conduct scientific experiments, and enter the orbital module for the first time, giving them access to toilet facilities. The exact activities of the crew were kept secret but were thought by some to include military reconnaissance, however, this is likely untrue given that similar experiments in the US and USSR determined that humans in space are not suited for military reconnaissance. It landed in the Siziwang Banner of Inner Mongolia on October 16, 2005, the same site as the previous crewed and uncrewed Shenzhou flights.

This is the first spaceflight for both crew members. The crew was introduced to the Chinese public and international media about five hours before the launch. Niè Hǎishèng celebrated his 41st birthday in space.

Huang Chunping, the chief designer of the Long March 2F rocket, was quoted in the Beijing Times as saying the crew members who would fly the mission were selected from a pool of three pairs. Five pairs of astronauts trained for the flight and about one month before launch the two pairs with the lowest performance were dropped. The Ta Kung Pao newspaper reported that Zhai Zhigang and Nie Haisheng were the leading pair, after having been in the final group of three for Shenzhou 5.