Katja Ebstein (born Karin Witkiewicz; 9 March 1945) is a German singer.

She achieved success with songs such as "Theater" and "Es war einmal ein Jäger".

Ebstein represented Germany at the Eurovision Song Contest three times, in 1970, 1971 and 1980.

She also took part in Ein Lied für Stockholm in 1975 with the song "Ich liebe dich", placing 5th in the selection.

As noted by John Kennedy O'Connor in his book The Eurovision Song Contest – The Official History,[1] Ebstein is the most successful performer to have taken part in the contest without ever winning.