Over a sharply produced, folksy groove, the Brit chanteuse crafts a guitar-driven declaration of resolute affection. The Daily Vault's Mark Millan wrote that the song is 'one of their finest ever moments.' He also described it as a 'beautifully soulful track thanks to Adu’s heartfelt vocal performance that greatly enhances the song.' Craig Seymour from Entertainment Weekly commented that since 1984, 'Sade has made a career out of crooning smoky romantic odes her first single in eight years, 'By Your Side,' is no different. This flavorful, mellow, powerful filled song is warm and allows the listener to understand the importance and sincerity of the lyrics.'

AllMusic editor Ed Hogan said that 'never before has the singer infused more mainstream rock elements (prominent strummed guitars) into her music as evidenced by the first single, 'By Your Side'.' Tanya Rena Jefferson of AXS considers it to be the group's best, commenting, ''By Your Side' is a heartfelt, beautiful song that allows Sade to express how one will not leave and will always be by one's side through thick and thin. Justin Chadwick from Albumism stated that it 'stands as one of the most endearing anthems of unconditional love to emerge in the 21st century thus far'. The single received favourable reviews from music critics.

8 Other versions and in popular culture.

Sade by your side in movie