Jan Otto Myrseth (born 2 July 1957) is a Norwegian prelate who is the current Bishop of Tunsberg.

Myrseth completed his theological studies in 1988 and was ordained in the summer of 1989.

On December 17, 2004, he was appointed Dean of the Ringerike deanery.

Myrseth also served as a hospital chaplain and as lecturer at the theological faculty of the Theological seminary of the University of Oslo.

On June 6, 2018, he was elected as bishop of Tunsberg by the Church Council and was consecrated in September of the same year.