How can I find out the address of someone who lives in Berlin, Germany?

Anonymous: You can use the online address finder here

You can use the online address finder here: https://www.deutschepost.de/de.html It won't work for people who have chosen to have their address removed from the public registry.

Orla C

Ask them to give it to you.

Verulam

If you search, using the name of the person, you may find it online unless the individual wants to remain private.

sunshine_mel

Ask them?

Elevo

Plenty of illegal ways. Legally, not sure.