Hartmann (born before 895; died 21 September 925) was abbot of the Benedictine Abbey of Saint Gall.
He was the successor to Abbot Solomon III, following one year of interregnum.
His tenure as abbot is only attested in one imprecisely dated document.
[1] He is thought to be the author of a lost piece about the history of his times.
The hymns of an eponymous author were likely not written by Hartmann of Saint Gall.