Southern Military District (Swedish: Södra militärområdet, Milo S), originally I Military District (Swedish: I. militärområdet) was a Swedish military district, a command of the Swedish Armed Forces that had operational control over Southern Sweden, for most time of its existence corresponding to the area covered by the counties of Malmöhus, Kristianstad (now joined as Skåne County), Blekinge, Kronoberg, Jönköping and Kalmar.

Milo S was created in 1966 along with five other military districts as part of a reorganisation of the administrative divisions of the Swedish Armed Forces.

In 2000, these last three military districts were disbanded and the command for the whole of Sweden was placed at the Swedish Armed Forces Headquarters, in accordance with the Defence Act of 2000.

Blazon: "Azur, an erect sword with the area letter (S - South) surrounded by an open chaplet of oak leaves, all or.

Blazon: "Azure, with waves argent six times divided bendy-sinister argent, charged with a doubletailed crowned lion rampant or, armed and langued gules.