Verdict
Yes — you can hold Germany and Poland citizenship simultaneously.
Germany
Dual citizenship policy
Permitted for Article 116 restitution and StAG §15 cases. For standard descent: generally requires renunciation, but 2024 dual citizenship reform now permits it.
Poland
Dual citizenship policy
Permitted — Poland allows dual citizenship (though it does not formally recognize it; Polish citizens are treated as Polish while in Poland).
Both Germany and Poland permit dual citizenship. You can acquire, hold, and use both passports simultaneously without legal restrictions.
This assessment is based on each country's current nationality law. Dual citizenship rules can change — always verify with the relevant consulate or an immigration attorney before making decisions about renunciation or acquisition.