Otto Maria Krämer (born 1964) is a German organist and church musician.
Krämer studied at the Folkwang Hochschule, Essen and at the Robert Schumann Hochschule Düsseldorf. His teacher was Wolfgang Seifen. In 1994 he passed his examination (A). Since 1993 he has worked as cantor and organist in Straelen. In 1995 he won the first prize of the Concours d'Improvisation a l'orgue Montbrison. He was teacher for improvisation at the Westminster Choir College in Princeton, New Jersey.