GRP
GRP may refer to:

Biochemistry
Gastrin-releasing peptide
Grp78, Grp94, Grp170, glucose-regulated proteins
Grape reaction product

Mathematics
Grp, the Category of groups

Technology and materials
Glass-reinforced-polymer, also known as Fiberglass, or Fibreglass.
Gentoo Reference Platform

Transport
Grove Park railway station, London, National Rail station code

Other uses
Government resource planning
US Grasslands Reserve Program
Gross rating point
Gross regional product
GRP Records, an American jazz label
Gurupi Airport, in Brazil