Altın Gün (meaning Golden Day in Turkish) is a Turkish psychedelic rock, also known as Anatolian rock, band from Amsterdam, Netherlands. It was founded by bassist Jasper Verhulst in 2016 when he posted an ad on Facebook looking for Turkish musicians. Their style has been described as "psychedelic" with a "dirty blend of funk rhythms, wah-wah guitars and analogue organs". Altın Gün also performs psychedelic rock covers of Turkish folk music. The band's vocalist Erdinç Ecevit Yıldız, is of Turkish origin, while the other four members are Dutch.

Their debut album was On, released in 2018. In 2019, they released Gece which was nominated for the 62nd Annual Grammy Awards (2019) in the Best World Music Album category. The band's first American tour commenced in mid 2019. In 2021, they released Yol which introduced synth-pop elements in combination with their traditional sound. The same year, they released Âlem, which continued to "push deeper into electronic pop". The album was released exclusively on Bandcamp with proceeds benefiting environmental non-profit Earth Today. Their latest album Aşk released on March 31, 2023.

The band was also featured in the soundtrack of the video game Star Wars Jedi: Survivor (2023). They released three tracks under the name of "Altin Lazer Blaster".

In June 2023, they released the soundtrack for the Apple TV ad Büyük Kaçış (The Great Escape) filmed around the Grand Bazaar in Istanbul.

In February 2024, the band announced on their social media pages that the female vocalist Merve Daşdemir has decided to quit the band and start a new musical chapter after her 8 year long career as one of the two vocalists.