| Honorific-Prefix: | The Honourable |
| Sir Nathaniel Rahumaea Waena | |
| Honorific-Suffix: | GCMG KStJ CSI |
| Order: | 5th Governor-General of Solomon Islands |
| Primeminister: | Allan Kemakeza Snyder Rini Manasseh Sogavare Derek Sikua |
| Term Start: | 7 July 2004 |
| Term End: | 7 July 2009 |
| Predecessor: | John Lapli |
| Successor: | Frank Kabui |
| Birth Date: | 1 November 1945 |
| Birth Place: | Su'utaluhia, Ulawa, British Solomon Islands |
Sir Nathaniel Rahumaea Waena GCMG, CSI, KStJ (born 1 November 1945) was the Governor-General of Solomon Islands from 2004 to 2009.
Waena was a Member of the National Parliament for Ulawa-Ugi constituency in the Makira-Ulawa Province from 1984 to 2004.[1] He served as Deputy Speaker of Parliament before becoming Assistant Prime Minister and Minister of Provincial Government in 2000,[2] and afterwards he became Minister for National Unity, Peace and Reconciliation.[3]
He was elected as Governor-General by the National Parliament on June 15, 2004. He received 27 of 41 votes, compared to 6 for incumbent Sir John Lapli and 8 for former Prime Minister Sir Peter Kenilorea.[4]
Sir Nathaniel was knighted soon after assuming office and later awarded the Cross of Solomon Islands (CSI).
On June 15, 2009, Frank Kabui was elected to succeed Waena as Governor-General. In the fourth round of voting, in which Kabui was elected with 30 votes, Waena received seven votes, placing third.[5]