Belgium
The United Kingdom
France and Britain both adminstered parts of Cameroon before Independence.
Before the advent of the Spanish the territory was unclaimed by any European power.
None
Alustrallia
It is owned by France, and is part of the European Union.
European traders came to Namibia primarily for its rich natural resources, including ivory, minerals, and later, diamonds. The region's strategic location along the Atlantic coast also facilitated trade routes. Additionally, European interest in colonization and the establishment of trade relationships with local indigenous groups motivated their presence in the area. Over time, these economic pursuits contributed to significant social and political changes in Namibia.
Many settled in modern-day South Africa, Angola, Namibia, Madagascar, Botswana, Mozambique, Swaziland, Zambia, Kenya, Zimbabwe, Mauritius, Equatorial Guinea, Ghana and Senegal. These nations still retain considerable white populations.
Is it the Vatican?
No. Mitsubishi is only related to Chrysler by 35% of their vehicles, but it is not owned by Chrysler. Mitsubishi is owned by European FC Truck Motor Company.
Historically, many European nations had colonies in Africa. However, Europe never "owned" the continent.