Brigadier General Stanley Price Weir, DSO, VD, JP (23 April 1866 – 14 November 1944) was an Australian public servant and Army officer.

During World War I, he commanded the 10th Battalion of the Australian Imperial Force (AIF) during the landing at Anzac Cove and the subsequent Gallipoli Campaign, and during the Battles of Pozières and Mouquet Farm in France.

Weir returned to Australia at his own request in late 1916 at the age of 50, and in 1917 he was awarded the Distinguished Service Order and was mentioned in despatches for his performance at Pozières and Mouquet Farm.

He assisted the surveyor who pegged out the land at the rear of Government House, Adelaide, for the Torrens Parade Ground, and was later promoted to clerk.

[4] Weir enlisted in the part-time South Australian Volunteer Military Force in March 1885, joining the 1st Battalion, Adelaide Rifles, as a private.

[5] On 1 July 1903, the Adelaide Rifles became the 10th Infantry Regiment of the Commonwealth Military Forces, and Weir was appointed adjutant.

[6] Weir assembled and trained his battalion at the Morphettville Racecourse, then embarked with them on the transport Ascanius on 20 October 1914 as the first convoy of Australian troops departed for overseas service.

On arrival in Fremantle, six companies of the 11th Battalion were embarked on the transport, and Weir was appointed Officer Commanding Troops for the voyage.

[11] Weir landed with the scout platoon, and urged both his men and those of the 9th Battalion to immediately begin climbing the cliffs that overlooked the beach.

He was subsequently evacuated to the United Kingdom, where he convalesced until January 1916, when he was appointed commandant of the Australian reinforcement camp at Weymouth, Dorset.

[15] In mid-1916, the bulk of the AIF was transferred to the Western Front, and Weir led the 10th Battalion through July and August 1916 during the Battles of Pozières and Mouquet Farm.

[14] By the time of the battle, Weir was the only original battalion commander remaining in the 1st Australian Division,[16] and had turned 50 years of age.

[2] In the Australian official history of the war, Bean observed that despite his age, Weir "took his battalion into the front line, commanded it there throughout its first battle, and remained longer in the field than almost any of the senior militia officers who had left with the original force".

Weir retired from the CMF as an honorary brigadier general in March 1921, his last appointment being as commander of the 20th Infantry Brigade.

Weir was not suited to this role, being unable to navigate the competing personal and political agendas of senior public servants and politicians, and was soon sidelined.

At various times he served as President of the Commonwealth Club, the Churches of Christ Union, the St. Peters Sub-Branch of the Returned and Services League, and the Cheer Up Society.