The 2013 South Australian National Football League season was the 134th season of the top-level Australian rules football competition in South Australia.
The season opened on 28 March with the opening fixture between West Adelaide and Central District, and concluded on 6 October with the Grand Final, in which minor premiers went on to record its 29th premiership, defeating by 40 points.
, , also made the top (final) five teams and participated in the finals series. , , , all missed the top five, with the last of those finishing last to record its 16th wooden spoon.
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The Ken Farmer Medal is awarded to the SANFL's leading goal scorer during the home and away season.