| Honorific-Prefix: | His Excellency |
| Constituency Mp2: | Boe |
| Parliament2: | Nauruan |
| Predecessor2: | Constituency Established |
| Successor2: | Detonga Deiye |
| Term Start2: | January 31, 1968 |
| Term End2: | January 22, 1991 |
| Office1: | President of Nauru |
| Deputy1: | Vinson Detenamo |
| Predecessor1: | Hammer DeRoburt |
| Successor1: | Bernard Dowiyogo |
| Term Start1: | 17 August 1989 |
| Term End1: | 12 December 1989 |
| Office3: | Speaker of the Parliament of Nauru |
| Predecessor3: | Itubwa Amram |
| Successor3: | Samuel Tsitsi |
| Term Start3: | January 1971 |
| Term End3: | January 1977 |
| Birth Date: | 17 April 1942 |
| Nationality: |  Nauruan |
| Spouse: | Millicent Aroi |
| Children: | Michael Aroi, a.o. |
Kenas Aroi (17 April 1942 – 22 January 1991) was a Nauruan political figure. He was President of the Republic of Nauru from 17 August to 12 December 1989.
Aroi was a member of the Parliament of Nauru, Speaker of the Parliament of Nauru from January 1971 to January 1977.[1] He was elevated to cabinet in January 1977. He was Minister of Finance under Bernard Dowiyogo in January 1978.[2]
Aroi was also Minister of Finance under Hammer DeRoburt from April 1979[3] to September 1986 and from October 1986[4] to December 1986. Before he became president, Aroi was involved in the Nauru Phosphate Corporation.
With support from Kennan Adeang, as Hammer DeRoburt was caught in a military situation, Aroi became president on 17 August 1989. Adeang then became finance minister. During his period of Presidential office Aroi experienced health problems and after a stroke in November 1989 he did not run in the elections in December of that year. He was succeeded on 12 December 1989 by Bernard Dowiyogo.[5]
Kenas Aroi was a member of the Eamwitmwit tribe. Aroi died on 22 January 1991.[5] [6] His widow, Millicent Aroi, is Nauru's High Commissioner to Fiji and a composer.