Ryōnan (綾南町; -cho) was a town located in Ayauta District, Kagawa, Japan.
On March 21, 2006 Ryōnan was merged with the town of Ayakami, also from Ayauta District, to form the new town of Ayagawa.
As of 2003, the town had an estimated population of 19,239 and a density of 500.10 persons per km². The total area was 38.47 km².