Kerstin Siebmann-Röders is a German puppeteer who played Tiffy on Sesamstrasse from 1977 until 1988.

She was married to Samson's original performer Peter Röders.

Tiffy was eventually handed over to puppeteers Marita Stolze and Sabine Falkenberg, respectively, until the character was retired after 27 years on the show in 2005.