Transformer is the second solo studio album by American recording artist Lou Reed. Produced by David Bowie and Mick Ronson, the album was released on November 8, 1972 by RCA Records. It is considered an influential landmark of the glam rock genre, anchored by Reed's most successful single, "Walk on the Wild Side", which touched on controversial topics of sexual orientation, gender identity, prostitution and drug use. Although Reed's self-titled debut solo album had been unsuccessful, Bowie had been an early fan of Reed's former band The Velvet Underground and used his fame to promote Reed, who had not yet achieved mainstream success.

Lewis Allan Reed was an American musician and songwriter. He was the guitarist, singer, and principal songwriter for the rock band The Velvet Underground and had a solo career that spanned five decades. Although not commercially successful during its existence, the Velvet Underground came to be regarded as one of the most influential bands in the history of underground and alternative rock music. Reed's distinctive deadpan voice, poetic and transgressive lyrics, and experimental guitar playing were trademarks throughout his long career.