| 1889 | Nihon Law School founded. The founder was the then Minister of Justice, Count Akiyoshi YAMADA. Count Kentaro KANEKO, LL.D. (Hon.), later Minister of Justice, installed as First Director. |
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| 1898 | Degree of Bachelor of Japanese Law instituted. |
| 1903 | Named Nihon University. |
| 1904 | Department of Political Science established. |
| 1906 | First overseas student sent to europe. |
| 1920 | Became a university based on the University Ordinance. First admission of female students. |
| 1940 | Department of Political Science and Economics established (formerly Department of Political Science). |
| 1947 | Department of Journalism established. |
| 1949 | Became a university under the new educational system. |
| 1951 | Graduate School based on the new school system established. |
| 1964 | Department of Business Law established. Department of Management and Public Administration established. |
| 2009 | Department of Public Policy and Affairs (formerly Department of Management and Public Administration) established. |
| 2010 | Graduate School of Journalism and Media established. Graduate School of Intellectual Property established. |