| Honorific-Prefix: | The Honourable |
| Losaline Maʻasi | |
| Honorific-Suffix: | MLA |
| Office: | Minister for Agriculture, Food, and Forests |
| Term Start: | 23 January 2019 |
| Term End: | 10 October 2019 |
| Predecessor: | Semisi Fakahau |
| Primeminister: | ʻAkilisi Pōhiva |
| Successor: | Lord Tuʻilakepa |
| Office2: | Minister for Internal Affairs and Sports |
| Term Start2: | 26 June 2018 |
| Term End2: | 21 January 2019 |
| Predecessor2: | ʻAkosita Lavulavu |
| Successor2: | Saia Piukala |
| Constituency Mp5: | Tongatapu 5 |
| Term Start5: | 16 November 2017 |
| Term End5: | 18 November 2021 |
| Predecessor5: | ʻAisake Eke |
| Successor5: | ʻAisake Eke |
| Party: | Democratic Party of the Friendly Islands |
Losaline Maʻasi is a Tongan politician, cabinet minister, and former member of the Legislative Assembly of Tonga for Tongatapu 5.
Maʻasi is a former chief executive of the Ministry of Agriculture.[1] She was first elected to parliament in the 2017 election. On 26 June 2018 she was appointed Minister of Internal Affairs and Sports, replacing ʻAkosita Lavulavu.[2] In January 2019 a minor cabinet reshuffle saw her swap her Internal Affairs portfolio for Agriculture, Food, and Forests.
She contested the 2021 Tongan general election, but was unsuccessful.[3]