Shenzhou 4 (Chinese: 神舟四号) launched on December 29, 2002, was the fourth unmanned launch of the Chinese spacecraft Two dummy astronauts were used to test the life support systems.

The spacecraft was equipped for a manned flight, even featuring a sleeping bag, food and medication. The windows were constructed of a new material that was designed to stay clear even after reentry to allow an astronaut to confirm that the parachutes have deployed properly. It was said that the spacecraft flown on Shenzhou 4 had no major differences to that used on Shenzhou 5. It flew with the ability for manual control and emergency landing, systems needed for a manned flight. A week before the launch, astronauts trained in the spacecraft to familiarise themselves with its systems.

Initially the spacecraft was in a 198 km by 331 km orbit inclined 42.4°. This was raised to 330 km by 337 km at 23:35 UTC on December 29. Also on January 4 and January 5 several smaller manoeuvres are thought to have taken place. The rate of orbital decay seemed higher after January 1, suggesting that the orbital module's solar panels may have been deployed for the first time. Compared to Shenzhou 3 the orbital period of Shenzhou 4 was much more tightly bounded with smaller manoeuvres.

The launch of Shenzhou 4 was watched by officials including Chairman of the Nataional People's Congress Li Peng; Vice Premier and member of the Politburo Standing Committee Wu Bangguo; Jia Qinglin, also a member of the Standing Committee; Cao Gangchuan, vice-chairman of the Central Military Commission; Song Jian, vice-chairman of the Chinese People's Political Consultative Conference; and Li Jinai, head of the General Armament Department of the People's Liberation Army.

The spacecraft carried 100 peony seeds to investigate the effect of weightlessness on plants grown from them. The 52 experiments onboard investigated areas in physics, biology, medicine, earth observation, material science and astronomy.

Four tracking ships were used for the mission - one off the coast of South Africa in the South Atlantic Ocean, one in the Indian Ocean near Western Australia, one in the North Pacific Ocean south of Japan, and one in the South Pacific Ocean west of New Zealand.

The reentry module landed safely on about 40 km from Hohhot in Inner Mongolia. As with previous flights, the command for reentry to begin was given by a tracking ship off the coast of South Africa. It was thought before the flight that the Chinese could attempt a waterlanding to test the emergency system but this did not eventuate. The orbital module remained in orbit until September 9, 2003.