Germany, Bulgaria and the Ottoman Empire.
They were:GermanyThe Ottoman EmpireHungaryBulgaria
Joined the Allies.
Germany and Ottoman Turkey
Germany and Italy
If you mean who Germany's allies were. Japan, Austria, and spain were their biggest allies.
Austria. They had been allies in WW1, but the Treaty of Versailles forbade their union after World War I.
Germany was in an alliance with Austria-Hungary and Italy.
Germany, Italy, Japan and Hungary/Austria.
Germany, Bulgaria, and the Ottoman Empire.
Germany,Austria,Hungry and the allies .
Austria-Hungary and Bulgaria were Germany's allies.