The term Collaborationist Chinese Army refers to the military forces of the puppet governments founded by Imperial Japan in mainland China during the Second Sino-Japanese War and World War II. They include the armies of the Provisional (1937–1940), Reformed (1938–1940) and Reorganized National Governments of the Republic of China (1940–1945), which absorbed the former two regimes.

Those forces were commonly known as puppet troops but went under different names during their history depending on the specific unit and allegiance, such as Nanjing Army. In total, it was estimated that all pro-Japanese collaborationist Chinese forces combined had a strength of around 683,000.

Originally, the Japanese did not allow Wang Kemin's Provisional Government of the Republic of China to have an army of its own and instead relied on a police force of 5,000 men for security. In May 1938 steps were taken towards forming an actual army for his government by opening a military academy in Beijing, with an initial intake of a hundred cadets for a one-year course. In February 1939, a Training School was opened for non-commissioned officers with one thousand cadets undergoing a six-month course. The target strength the Provisional Government wanted to reach was 13,200 men divided into 8 infantry regiments, with six of them being formed into brigades, commanded by a Chinese major general and a Japanese advisor. Along with graduates of the academies, who were given the rank of lieutenant or second lieutenant, there were also former Nationalist and warlord officers. In addition, there was also a 400-man bodyguard unit for Wang.

The Provisional Government Army's order of battle was as follows:

The poorly-organized Reformed Government of the Republic of China, which managed the occupied zones in central China, raised a minimal armed force of generally poor quality. In December 1938, Pacification Minister Ren Yuandao announced that the army consisted of 10,000 troops. A military academy was established with 320 cadets between the ages of eighteen and twenty-five, with the intent of creating a new officer class "untainted" by prior service in the Nationalist Army and loyal to the Reformed Government. The year-long training course was given by Japanese officers. However, their training was cut short as the expanded army, which numbered 30,000 men by November 1939, needed officers. Its quality was low, as reports indicated that Reformed Government troops fled from guerillas that they engaged.

The Reformed Government Army was initially organized as follows:

In addition, a 'water patrol corps' was created in June 1939 to police the coastline and inland waterways. It was commanded by Vice Admiral Xu Jianding, the former commander of the Nationalist navy's Yangtze Squadron. A water police training school was established with 150 cadets trained by 30 Japanese and 30 Chinese instructors. However, it had few vessels to carry out its duty with. There were also plans to form an air force and several training gliders were purchased from Japan, but these plans never came to fruition by the time the Reformed Government was merged with the newly-formed Reorganized National Government of China as the Nanjing Army in 1940.

During its existence, the Reorganized National Government of the Republic of China fielded a force that was estimated by Western sources to have been between 300,000 and 500,000 strong. Wang Jingwei initially planned to raise a force of twelve divisions under his personal command, although most Nanjing Government troops were only under his nominal control throughout the war. All military matters were theoretically managed by the Central Military Commission, but in reality the body was largely symbolic and had little authority. The Nanjing Army commanders were able to operate without much interference from Wang's government and in many cases were former warlords or officers of Chiang Kai-shek's Nationalist Army. Wang initially recruited his troops from former Nationalist soldiers and the collaborationist troops that had previously served the Provisional and Reformed Governments, which were both united under Wang's command. In the "Japan–China Military Affairs Agreement" signed by Japan and the Reorganized National Government, the Japanese agreed to train and equip an unspecified number of divisions for the Nanjing Army. They were provided with mostly captured Nationalist equipment along with small amounts of Japanese weapons.