Pieter Gaal (19 July 1769 in Middelburg – 13/18 January 1819 in Middelburg) was a Dutch painter, the son of Thomas Gaal.
Gaal came from a family of painters from the Zeeland area of the Netherlands, his earliest ancestor was a knight called Florens Ghale van Hoesbroec, though his father was born in what is now Belgium.
His son Jacobus Cornelis Gaal was also a painter, painting portraits such as "Junges Madchen in Weissen Kleid Beim Einkleid" a portrait of a young woman being dressed by a maidservant.
Gaal's main focus were "landscapes with cattle and figures furnished, a hobby portraits, living and dead game and genre pieces".