The Southern constituency (No.218[a]) is a Russian legislative constituency in Saint Petersburg.

Until 2007 Southern constituency was based in eastern Saint Petersburg, covering Frunzensky and Nesvky districts.

However, in 2016 Saint Petersburg constituencies were drastically redrawn with territory of the former Southern constituency being split between Eastern and South East constituencies.

New Southern constituency was made from parts of now obsolete Admiralteysky and South West constituencies.