U.S. Post Office, Customhouse, and Courthouse | |
 Building in 2019 | |
  | |
| Location | 335 Merchant Street, Honolulu, Hawaii |
|---|---|
| Coordinates | 21°18′22″N 157°51′38″W / 21.30611°N 157.86056°W |
| Area | 2.8 acres (1.1 ha) |
| Built | 1922 |
| Architect | York & Sawyer |
| Architectural style | Mission/Spanish Revival |
| NRHP reference No. | 75000620[1] |
| Added to NRHP | January 27, 1975 |
The King David Kalakaua Building in Honolulu, Hawaii is a government building formerly known as the U.S. Post Office, Customhouse, and Courthouse. It was the official seat of administration in the Territory of Hawaii and state of Hawaii for the United States federal government.