| Province: | British Columbia |
| Fed-Status: | defunct |
| Fed-District-Number: | 59026 |
| Fed-Created: | 1996 |
| Fed-Abolished: | 2013 |
| Fed-Election-First: | 1997 |
| Fed-Election-Last: | 2011 |
| Demo-Pop-Ref: | [1] |
| Demo-Area-Ref: | [2] |
| Demo-Census-Date: | 2011 |
| Demo-Pop: | 97952 |
| Demo-Electors: | 74996 |
| Demo-Electors-Date: | 2011 |
| Demo-Area: | 26248.34 |
| Demo-Cd: | Okanagan-Similkameen, Kootenay Boundary, Central Kootenay |
| Demo-Csd: | Nelson, Castlegar, Trail, Osoyoos, Oliver, Grand Forks, Okanagan-Similkameen C, Central Kootenay E, Central Kootenay F, Central Kootenay H, |
British Columbia Southern Interior (formerly known as Southern Interior, Kootenay—Boundary—Okanagan and West Kootenay—Okanagan) was a federal electoral district in the province of British Columbia, Canada, that had been represented in the House of Commons of Canada from 1997 to 2015.
Regions included in the riding are the Similkameen, the southern half of the South Okanagan region, the Boundary Country, all of the West Kootenay region, the Slocan Valley, Lower (but not Upper) Arrow Lake, and including the east shore of Kootenay Lake from opposite Kaslo northwards.
Municipalities within the riding are Princeton, Keremeos, Oliver, Osoyoos, Greenwood, Grand Forks, Trail, Rossland, Warfield, Montrose, Fruitvale, Castlegar, Nelson, Salmo, Slocan, New Denver, Silverton, and Kaslo.
This riding was created in 1996 as "West Kootenay—Okanagan" from parts of Kootenay West—Revelstoke and Okanagan—Similkameen—Merritt ridings.
It consisted of:
It was renamed "Kootenay—Boundary—Okanagan" in 1998.
In the 2003 redistribution, the riding was replaced by the new riding of Southern Interior, with a small part being redistributed into Kootenay—Columbia and a small part added from Okanagan—Coquihalla.
In 2004, its name was changed to "British Columbia Southern Interior".
|- bgcolor="white"|align="left" colspan=2|NDP gain from Conservative|align="right"|Swing|align="right"|+15.6|align="right"|