Kelvington is a rural municipality located in Southeast Saskatchewan, Canada. The independently governed town of Kelvington lies within the geographical borders of the R.M., as does the Yellowquill 90 First Nations Indian reserve, but neither is technically part of Kelvington No. 366. The town was named for William Thomson, 1st Baron Kelvin scientist and inventor. The population of the town was 866 in 2006, whereas the R.M.