| Joshua Koshiba | |
| Office2: | President of the Senate of Palau |
| Term Start2: | 27 March 2007 |
| Term End2: | 25 April 2007 |
| Predecessor2: | Johnny Reklai |
| Successor2: | Surangel S. Whipps |
| Term Start3: | October 1986 |
| Term End3: | 1991 |
| Predecessor3: | Isidoro Rudimch |
| Successor3: | Isidoro Rudimch |
| Birth Date: | 10 December 1943 |
Joshua Koshiba (born 10 December 1943) is a former member of the Senate of Palau. After his re-election in 2004, he became the longest-serving member of that body in the history of Palau. Koshiba was elected seven consecutive terms as Senator from 1980 to 2008.[1]
Koshiba was born in Peleliu. He graduated from the University of Guam, holding a degree in mathematics.[2]
Koshiba was first elected to the Palauan Senate in 1980.[2] In 1984, he became chairman of the Senate Committee on Foreign Affairs. In 1986, he became Senate President, a post which he held until 1991. He again chaired the Senate Committee on Foreign Affairs from 1992 to 1996; in 1996, he was appointed chairman of the Senate Committee on Education. He headed the Senate Committee on Health and Education from 2000 to 2008.[3]
On 27 March 2007 he was elected as President of the Senate to succeed Johnny Reklai, who had died in a boating accident. On 25 April 2007, Surangel S. Whipps was elected to succeed him as Senate President.[4] In 2008, he announced his intentions to run for President;[5] however, he withdrew his bid following defeat in the primary race.[6]