Gulshan Devaiah is an Indian actor known for his work in Hindi movies. Born and brought up in Bengaluru, Devaiah completed his schooling at St Joseph's Indian High School. Later, he graduated from the National Institute of Fashion Technology and worked in the fashion industry for ten years.

Devaiah started working as an actor in plays at Bengaluru's English theatre. His first role was in Anurag Kashyap's short film named That Girl in Yellow Boots (2010). He was nominated for Best Male Debut at the Filmfare Awards for his role.

His next role was in Dum Maaro Dum (2011), a crime thriller.

Devaiah's first significant hit was Bejoy Nambiar's Shaitan (2011). He received nominations for Best Male Debut and Best Actor in a Supporting Role in Filmfare Awards and Screen Awards, respectively, for his role in the movie.

He got his first lead role in the Hate Story (2012), where he played the antagonist Siddharth Dhanrajgir. He next starred in Peddlers (2012).

He also appeared in Sanjay Leela Bhansali's Goliyon Ki Raasleela Ram Leela (2013). Devaiah next appeared in an adult comedy named Hunterrr (2015), where he played the role of a sex addict. His subsequent releases include Junooniyat (2016) and A Death in the Gunj (2016).

In 2018, Devaiah played a double role in the action comedy Mard Ko Dard Nahin Hota (2018). He won the Screen Awards for Best Supporting Actor and a nomination for the same at Filmfare Awards. He also appeared in the web series Smoke (2018).

His subsequent roles were in the romantic drama Cabaret (2019) and the psychedelic thriller Candyflip (2017). He also starred in Commando 3 (2019). In 2020, he appeared in Ghost Stories (2020), Afsos (2020), Unpaused (2020), and Footfairy (2020).

Devaiah also played a supporting role in Badhaai Do (2022). He next appeared in the horror thriller film Blurr (2022) and a crime drama web series, Shiksha Mandal (2022). He also acted in Duranga (2022), a Hindi adaptation of the Korean drama Flower of Evil (2020).