Guyana
| 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 |
|---|---|---|---|---|---|---|
| 2025 | PR | List PR | 2 | 65 | 65 | Not applicable |
| 2020 | PR | List PR | 2 | 65 | 65 | Not applicable |
| 2015 | PR | List PR | 2 | 65 | 69 | Not applicable |
| 2011 | PR | List PR | 2 | 65 | 67 | Not applicable |
| 2006 | PR | List PR | 2 | 65 | 69 | Not applicable |
| 2001 | PR | List PR | 2 | 65 | 65 | Not applicable |
| 1997 | PR | List PR | 2 | 65 | 65 | Not applicable |
