Tajul is a given name. Notable people with the name include:
Ratu Safiatuddin Tajul Alam or Taj ul-Alam (1612–1675), the fourteenth ruler of Aceh Tajul Islam Choudhury (1944–2018), Bangladeshi politician Tajul Islam Md. Faruk (died 2019), Bangladesh Awami League politician and Jatiya Sangsad member Tajul Hossain, veteran of the Bangladesh Liberation War, Health Secretary of Bangladesh A. B. Tajul Islam (born 1951), Bangladesh Awami League politician and Jatiya Sangsad member Mohammad Tajul Islam, Bangladeshi lawyer at the Bangladesh Supreme Court Tajul Islam (scholar) (1896–1967), Bengali Islamic scholar, debater and politician Tajul Islam (worker), shifting worker at the Adamjee Jute Mills in Bangladesh Syech Yusuf Tajul Khalwati (1626–1699), Indonesian Muslim of noble Makassar descent Tajul Muluk (born 1971), Shia religious leader of Madura Island, Indonesia Tajul Ariffin Shah of Perak (died 1594), the fourth Sultan of Perak
See also Tajul muluk, a commonly used name for a system of geomancy for siting or designing buildings