Alireza Tangsiri (Persian: علیرضا تنگسیری;‎ 1962 – 26 March 2026) was an Iranian naval officer who served as the commander of the IRGC Navy. He was killed by the Israel Defense Forces during the 2026 Iran war.

Tangsiri was a naval brigade commander during the Iran–Iraq War. He later headed the Islamic Revolutionary Guard Corps Navy (IRGCN) 1st Naval District in Bandar Abbas.

In September 2007, Tangsiri said that if the United States were "to clash with us, we would chase them even to the Gulf of Mexico."

In January 2016, after Iran detained 10 US sailors in the 2016 United States–Iran naval incident when they had engine failure and entered Iranian waters, Tangsiri described it as "U.S. forces surrendering to Iran."

On 23 August 2018, Iran's Supreme Leader, Ali Khamenei, appointed Tangsiri as commander of the IRGCN.

In November 2021, Tangsiri said that the United States had "come to realize the Islamic Republic’s superiority at sea." In February 2025, he unveiled Iran's first drone carrier, a commercial vessel that had been repurposed, which he described as the “largest naval military project” in the history of Iran. In March 2025, Tangsiri warned that "If the enemies make a mistake, we will send them to the depths of hell," after U.S. President Donald Trump wrote Iran's supreme leader Khamenei urging Iran to reach a nuclear agreement with the U.S. or else face military action.

In April 2025, Tangsiri said that the United States Navy was "incapable" of challenging Iran's maritime dominance.

In 2013, Tangsiri said: "the Israelis are Jews and the Americans are Christians. Our Quran stresses that they are not our friends."