Kangasniemi is a municipality in the South Savo region, Finland. The municipality has a population of and covers an area of {{Data Finland municipality/total area Kangasniemi|km2}} of which {{Data Finland municipality/waters area Kangasniemi|km2|abbr=on}} is water. The population density is {{Data Finland municipality/population density Kangasniemi|PD/km2}}.

Kangasniemi is located on the Finnish national road 13,