Michael Ingo Joachim Weikath (7 August 1962, Hamburg, Germany) is the guitarist of the German Power metal band called Helloween.

Weiki is one of the Helloween founding members, and along with the musicians Kai Hansen (vocals/guitars), Markus Grosskopf (bass) and Ingo Schwichtenberg (drums). Along with Grosskopf he is the only other original member still active in the band. Weikath integrated the first Helloween line up in 1982. In 1984, the band had signed a deal with Noise Records and recorded two songs for a Noise compilation record called Death Metal. In this album, he was responsible for the track Oernst Of Life. Nowadays Michael Weikath lives in his home in Tenerife, Spain.