Argo Australia provides real-time observations of the oceans around Australia by maintaining an array of autonomous profiling floats. Argo floats measure temperature and salinity from 2000 m depth to the surface every 10 days. Data is supplied within 24 hours via the real-time data stream and highly quality-controlled data is available after 6 months as part of the delayed mode data stream. Argo provides the essential and in situ data for ocean and climate research and prediction/re-analyses. Argo Australia is operated by CSIRO Marine and Atmospheric Research based in Hobart, Tasmania with cash and operational support from the Bureau of Meteorology, financial support from IMOS, CSIRO, the Antarctic Climate and Ecosystem Cooperative Research Centre and the Department of Climate Change and Energy Efficiency.