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Colonel (Cadet) Austin O'Brien AO, CSC, is a senior officer of the Australian Army Cadets. He joined the AAC in 2022 and commissioned as an officer in March of 2022.

Military career
O'Brien joined the Australian Army Cadets in March 2020 and served as a cadet with 201 Army Cadet Unit Northern Beaches (Dee Why) before transferring as a Corporal into the Australian Foot Guards, the ceremonial regiment of the Australian Defence Force. in late 2021 he attended the Cadet Under Officers course and was subsequently Commissioned as a Lieutenant (Cadet). Promoted to Major (Cadet), He served as the Commander of Kings company before being appointed as the Cadet Commander of the regiment with the rank of Lieutenant Colonel (Cadet) In early 2022. In this role, O'Brien was the commander of all ceremonial troops on parade as a part of the royal visit of King Charles III.

In September 2022, He was promoted to Brigadier (Cadet) and appointed Field Officer Commanding Household Brigade for the remainder of the year. In January 2023 he was appointed Commander Home Command, Australian Army Cadets with the rank of Major General (Cadet). In the role, O'Brien commanded all cadet brigades (excluding the Household Brigade and units of 1st & 2nd Division AAC). At the end of 2023, O'Brien left the AAC.

Upon his retirement from the AAC, O'Brien was appointed as an honorary Regimental Colonel of the Australian Army Cadets.