Kamerun was an African protectorate of the German Empire from 1884 to 1916 in the region of today's Republic of Cameroon. Kamerun also included northern parts of Gabon and the Congo with western parts of the Central African Republic, southwestern parts of Chad and far northeastern parts of Nigeria.

The first German trading post in the Duala area on the Kamerun River delta was established in 1868 by the Hamburg trading company C. Woermann [de]. The firm's primary agent in Gabon, Johannes Thormählen, expanded activities to the Kamerun River delta. In 1874, together with the Woermann agent in Liberia, Wilhelm Jantzen, the two merchants founded their own company, Jantzen & Thormählen there.

Both of these West Africa houses expanded into shipping with their own sailing ships and steamers and inaugurated scheduled passenger and freight service between Hamburg and Duala. These companies and others obtained extensive acreage from local chiefs and began systematic plantation operations, including bananas. The Cameroon territory was under the informal control of the British Empire throughout the years preceding 1884, with substantial British trading operations as well.

Eventually, these companies would begin agitating for royal protection. By 1884, Adolph Woermann, as spokesman for all West African companies, petitioned the imperial foreign office for "protection" by the German Empire. This, among a number of other factors, led to Imperial Chancellor Otto von Bismarck approving the establishment of a colony.

For many years prior to the 1880s, Bismarck had resisted the idea of colonial ventures in Africa. This was primarily due to Bismarck's focus on shoring up German interests in Europe itself, especially given the lack of a military infrastructure able to protect colonial interests. Moreover, Germany had no need for the resources that a colony might provide, being largely self sufficient, so a colony would only function as an economic drain. This perspective would change in the early 1880s, due to a variety of internal pressures.

The two key factors motivating this change were pressure from economic interests in Germany, and concerns about missing out on what would later be called the Scramble for Africa. On the political side, colonies became a point of national pride, as Germans saw that other nations had colonies, and thought they should too as a matter of national prestige. Several government officials took this stance, and it seemed to enjoy public support as well. On the commercial side, the companies already operating in Cameroon (represented by the likes of Adolph Woermann) wanted the protection and support an official German colony would provide, and many German producers sought new markets for their excess goods.

These pressures would eventually culminate in Bismarck allowing the establishment of a Cameroonian colony, among others.

The official beginning of the German "Protectorate of Cameroon" was on 17 August 1884. Gustav Nachtigal had arrived in Duala in July and negotiated a treaty with a number of rulers local to the region around Duala, at that time the center of Germany's trading operations. From there, he would go on to other parts of Cameroon, securing further treaties with a number of tribes of the regions around the rivers, where trade was already well established. This would establish a trend of using treaties as one method of expanding German control.