Nauru
| Year | Electoral system family | Electoral system for national legislature | Number of tiers | Legislative size (directly elected) | Legislative size (voting members) | Electoral system for the president |
|---|---|---|---|---|---|---|
| 2022 | Other | Modified BC | 1 | 19 | 19 | Not applicable |
| 2019 | Other | Modified BC | 1 | 19 | 19 | Not applicable |
| 2016 | Other | Modified BC | 1 | 19 | 19 | Not applicable |
| 2013 | Other | Modified BC | 1 | 19 | 19 | Not applicable |
| 2010 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 2008 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 2007 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 2004 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 2003 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 2000 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 1997 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 1995 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
| 1992 | Other | Modified BC | 1 | 18 | 18 | Not applicable |
