Alexander Forrest CMG (22 September 1849 – 20 June 1901) was an explorer and surveyor of Western Australia, and later also a member of parliament.

In 1874, Alexander was part of another party again including brother John which took a more northerly route from Geraldton to the east to the Murchison River.

The coast was then skirted to the Fitzroy River which was followed for 240 miles (390 km); but Forrest's progress was then stopped by mountains which appeared to be impassable.

The party was often in danger of starvation, on more than one occasion a packhorse had to be killed for food, and in the last dash for the telegraph line, Forrest and one companion who had gone on ahead almost perished from thirst.

[3] In 1891, through a syndicate comprising Charles Crossland and George Leake, Alexander Forrest commenced the subdivision of what would later become the affluent Perth suburb of Peppermint Grove.

[5] He was survived by four of his five children (his son Anthony Alexander Forrest having been killed the month before in the Second Boer War), and was buried at Karrakatta Cemetery.