"Mr. Nilsson" is a song by the Swedish band ABBA, featured on their 1973 album "ABBA." The song tells the story of a cat named Mr. Nilsson, who is loved by the narrator. It captures the playful and affectionate bond between the pet and its owner. The song is notable for its catchy melody and lighthearted lyrics. It showcases ABBA's signature pop style, blending harmonies and upbeat rhythms. "Mr. Nilsson" reflects the band's ability to create memorable tunes that resonate with listeners, contributing to their popularity in the 1970s and beyond.