Nyerere Day is observed annually on October 14 in Tanzania. It commemorates the passing of Julius Nyerere, former president of Tanzania, on this day in 1999.

Julius Kambarage Nyerere (13 April 1922 – 14 October 1999) was a Tanzanian anti-colonial activist, politician, and political theorist. He governed Tanganyika as prime minister from 1961 to 1962 and then as president from 1962 to 1964, after which he led its successor state, Tanzania, as president from 1964 to 1985.

Nyerere stepped down as president in 1985 to devote himself to farming and pursue his vision of a Pan-Africanist union via international diplomacy. He played a central role through his Nyerere Foundation in attempts to bring peace to the Great Lakes region.

His foundation has been involved in as yet unsuccessful attempts to mediate a solution to the ongoing civil war in Burundi - where more than 200,000 people have died since 1993.

Across Africa, he gained widespread respect as an anti-colonialist and in power received praise for ensuring that, unlike many of its neighbors, Tanzania remained stable and unified in the decades following independence

He is held in deep respect within Tanzania, where he is often referred to by the Swahili honorific Mwalimu ("teacher") and described as the "Father of the Nation."