Hello everybody..
I am interested in starting a PhD in Germany but... I don't speak German at all!
I know it sounds a bit silly but do you know any German law faculty where sb can do a PhD in English?
Please help..

I don't I'm afraid!
The reason is that in Germany you don't do a PhD, but a Dr.iur. (Doctor of Jurisprudence), which is in effect the same, but usually is assesst by a dissertation (about 150-300 pages) in German and an additional oral examination (a Rigorosum or a Disputation) also in German. There may be some exceptions at some Universities however, where you can do it in English.

My advice, apply for Professors who have done a LLM in an English speaking country. They should be more open towards a Dr.iur. dissertation in English than those who don't have an international experience/title.

Thank you very much for your advice TiGGer but it's difficult for me to find their CV's as all sites are in German. Anyway, can u propose me any uni more "open minded" to English? Thanks again!

Well, most of the Professors add to their names the LL.M. plus the city, where they did their LL.M.
For example, my professor of international law is called Prof. Dr. Oliver Dörr, LL.M. (London). I studied at the University of Osnabrueck by the way. So, now you already have one name :-) But there are many many more Professors who have an LL.M. from an English speaking country. At my University also Prof. Dr. Dirk Verse, MJur (Oxford) or Prof. Dr. Andreas Fuchs, LL.M. (Ann Arbor/Michigan) have this kind of international experience.
In which field do you want to do your PhD/Dr.iur.? Maybe I can help you with a name of a famous Professor in this field. In addition, the University of Osnabrueck also offers a LL.M. for law graduates who don't come from Germany. Maybe that would be a good start for you for a career in the academia in Germany.

TiGGer thanks a lot for your help!
I must admit that your professors have quite impressive cv's..
Well I am interested in public law and as far as I know Germans are experts on that field that's why I'm instisting on it! Thank you again..