Ulf Lennart Nilsson (18 September 1948 – 22 September 2021) was a Swedish writer[1] who published more than 100 books and picture books, geared mainly to children and adolescents.

[2] He was also the longtime president of the Swedish Academy for Children's Books.

A number of his works have been translated into English by Gecko Press.

Nilsson died on 22 September 2021, at the age of 73.

[3] Nilsson has received the August Prize (Augustpriset) twice, the only writer for children and young adults to have been so recognized,[11] and a distinction he shares with only four other writers for readers of any age.