Minster of Labour and Social Security, Alhaji Alpha Osman Timbo is a Sierra Leonean politician, educationist, lecturer and trade unionist. He was Sierra Leone Minister of Labour and Industrial Relations from 2001-2002 under president Ahmad Tejan Kabbah.

He unsuccessfully ran for the presidential candidate of the Sierra Leone People’s Party (SLPP) ahead of the 2012 Sierra Leone presidential elections. He finished in fourth place at the July 31, 2011 SLPP convention held at the Miata Hall in Freetown, behind Julius Maada Bio, Usman Boie Kamara and Andrew Keili. Timbo had served as the Secretary General of the Sierra Leone Teachers’ Union. He had also served as the chairman of the Sierra Leone National Premier League. He is the current chairman of Sierra Leone Premier League Club Mighty Blackpool.

Timbo was born in the small rural town of Rokulan, Sanda Tendaren Chiefdom, Bombali District in the Northern province of Sierra Leone. He was born to an ethnic Temne father named Alhaji Minkailu Timbo, and to an ethnic Fula mother named Haja Adiatu Barrie. He attended the Bombali District Education Committee primary school in his hometown of Rokuland from 1967 to 1973 and then proceeded to the St. Francis Secondary School in Makeni, where he completed up to form five level of education from 1974 to 1979. In 1980, he transferred to the Ahmadiyya Muslim Secondary School in the capital Freetown where he completed his secondary education in 1981. Immediately after secondary school in 1981, Timbo enrolled at the Fourah Bay College and graduated with a Bachelor of Arts Degree in History, Law and Philosophy in 1985.