| Honorific-Prefix: | The Honourable |
| Mathew Batsiua | |
| Constituency Mp: | Boe |
| Parliament: | Nauruan |
| Predecessor: | Kinza Clodumar |
| Successor: | Asterio Appi |
| Term Start: | October 23, 2004 |
| Term End: | July 9, 2016 |
| Birth Date: | 27 May 1971 |
| Birth Place: | Nauru |
| Nationality: |  Nauruan |
| Residence: | Boe |
| Profession: | public servant |
Mathew Jansen Batsiua (born 27 May 1971[1]) is a Nauruan politician.[2] Batsiua, a former health minister and former foreign minister of Nauru, has served as a member of parliament for the constituency of Boe since 2004.[3]
Batsiua has been elected to parliament in the 2004 general elections, ousting long-time parliamentarian and former president Kinza Clodumar. He has been re-elected in the 2007 and 2008 elections.
He was Minister of Finance in the cabinet of Marcus Stephen from July 2011[4] to November 2011. He was appointed as Minister Assisting the President of Nauru in the short-lived cabinet of Frederick Pitcher in November 2011.
He represented the Boe Constituency in the Parliament of Nauru. He was defeated in the 2016 parliamentary election.[5]
See main article: Nauru 19. In 2014, Batsiua along with other opposition MPs were suspended from their parliament seats.[6] In June 2015, there was an anti-government protest against this.[7] Batsiua was arrested, and 18 other people in total were charged, dubbed the Nauru 19.[8] [9] On 13 September 2018, they were granted a permanent stay on their case.[10] The government appealed, and the stay was lifted. In December 2019, Batsiua was sentenced to 11 months in prison.[11] He was released in April 2020.[12]