Tin Aung San (Burmese: တင်အောင်စန်း; pronounced [tɪ̀ɰ̃ àʊ̃ sʰáɴ]; born 16 October 1960) is a Burmese navy officer who is currently serving as Deputy Prime Minister of Myanmar, member of State Administration Council (SAC) and the Union Minister for Defence.

Tin Aung San graduated from the Defence Services Academy in 1982 as part of the 23rd intake. Tin Aung San was promoted as Commander-in-Chief of the Myanmar Navy in August 2015, succeeding Admiral Thura Thet Swe, who retired to run for political office.

After the 2021 Myanmar coup d'état, Tin Aung San was appointed a member of the State Administration Council (SAC) on 2 February 2021. He subsequently relinquished his position as the Commander-in-Chief of the Myanmar Navy, with Admiral Moe Aung assuming the role.

On the following day (3 February 2021), he was appointed the Minister of Transport and Communications by the SAC. In this regard, the Committee Representing Pyidaungsu Hluttaw (CRPH) claims that the military regime’s cabinet is illegitimate.

A cabinet reshuffle in 1 February 2023, he was appointed Deputy Prime Minister, along with Soe Win, Mya Tun Oo, Soe Htut, Win Shein and Than Swe, concurrently as Minister for Transport and Communications.

Following the dissolution of State Administration Council on 31 July 2025, he is part of the new cabinet under Nyo Saw as Union Minister 1 for the President's Office.

On 5 August 2025, the National Defence and Security Council appointed Tin Aung San as National Security Advisor. He served this post concurrently with Union Minister 1 of the President's Office.

The U.S. Department of the Treasury has imposed sanctions on Tin Aung San since 11 February 2021, pursuant to Executive Order 14014, in response to the Myanmar's military’s coup against the democratically elected civilian government of Myanmar (Burma). The US sanctions include freezing of assets under the US and ban on transactions with US person.