David St. Hubbins is a fictional character from the mockumentary film *This Is Spinal Tap*, which was released in 1984. He is portrayed by actor Michael McKean and serves as the lead singer and rhythm guitarist of the fictional rock band Spinal Tap. The character is known for his flamboyant personality and humorous interactions with bandmates. In the film, David St. Hubbins embodies the archetype of a struggling rock star, often caught up in the absurdities of the music industry. His character highlights the challenges and comedic situations faced by musicians, making him a memorable figure in the realm of rock music parodies.