Oodla Wirra (formerly Penn) is a small town in the upper Mid North of South Australia.

It is on the Barrier Highway approximately halfway from Adelaide to Broken Hill.

When the railway was built in 1880, a siding was provided, named Oodla Wirra.

This naming conflict continued until 1940, when the town was renamed Oodla Wirra, to match the railway station.

A railway employee was killed in a shunting accident in the Oodla Wirra railyards in 1909.