| Francis Lucas Nyalali | |
| Birth Date: | 1935 2, df=yes |
| Birth Place: | Kasubuya, Mwanza, Tanganyika Territory |
| Death Place: | Dar es Salaam, Tanzania |
| Office1: | 4th Chief Justice of Tanzania |
| President1: | Julius Nyerere |
| Term Start1: | 1977 |
| Term End1: | 2000 |
| Predecessor1: | Augustine Saidi |
| Successor1: | Barnabas Samatta |
| Term Start2: | 1991 |
| Term End2: | 2002 |
| Occupation: | Lawyer Judge |
Francis Lucas Nyalali (3 February 1935 – 2 April 2003) was the Chief Justice of Tanzania from 1977 to 2000. He is known for promoting easy access to justice, the rule of law, constitutionalism, and human rights. To date, he remains the longest-serving Chief Justice of Tanzania. His tenure was notably longer compared to the average serving time for a Chief Justice within the Commonwealth of Nations, which is approximately 3.6 years. He is known for promoting easy access to justice, the rule of law, constitutionalism, and human rights.
In 1991, he chaired a presidential commission to review Tanzania's political system which was dubbed 'Nyalali Commission'. The commission recommended, among other things, the reintroduction of multi-party politics in the country and a review of the union structure between Tanganyika and Zanzibar.https://www.thecitizen.co.tz/tanzania/news/national/-nyalali-commission-recommends-restoration-of-multi-party-politics-2708724