Trinidad and Tobago
| 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 | Plurality/Majority | FPTP | 1 | 41 | 41 | Not applicable |
| 2020 | Plurality/Majority | FPTP | 1 | 41 | 41 | Not applicable |
| 2015 | Plurality/Majority | FPTP | 1 | 41 | 41 | Not applicable |
| 2010 | Plurality/Majority | FPTP | 1 | 41 | 41 | Not applicable |
| 2007 | Plurality/Majority | FPTP | 1 | 41 | 41 | Not applicable |
| 2002 | Plurality/Majority | FPTP | 1 | 36 | 36 | Not applicable |
| 2001 | Plurality/Majority | FPTP | 1 | 36 | 36 | Not applicable |
| 2000 | Plurality/Majority | FPTP | 1 | 36 | 36 | Not applicable |
| 1995 | Plurality/Majority | FPTP | 1 | 36 | 36 | Not applicable |
| 1991 | Plurality/Majority | FPTP | 1 | 36 | 36 | Not applicable |
