Princess Sunnyi of Sayn-Wittgenstein-Sayn (née Melles, born 7 October 1958 in Luxembourg, Luxembourg) is a Swiss-Hungarian actress active in Germany and Austria.

She is the only daughter of Austrian orchestral conductor Carl Melles and Hungarian noblewoman Judith von Rohonczy (1929-2001), an actress, daughter of actress Ila Lóth.

Since 1993, she has been married to Prince Peter of Sayn-Wittgenstein-Sayn (b.

1954), son of photographer Marianne, Princess zu Sayn-Wittgenstein-Sayn.

This article about a German television actor is a stub.