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We present an analysis of the global stellar populations of galaxies in theSAMI Galaxy Survey. Our sample consists of 1319 galaxies spanning four ordersof magnitude in stellar mass and includes all morphologies and environments. Wederive luminosity-weighted, single stellar population equivalent stellar ages,metallicities and alpha enhancements from spectra integrated within oneeffective radius apertures. Variations in galaxy size explain the majority ofthe scatter in the age--mass and metallicity--mass relations. Stellarpopulations vary systematically in the plane of galaxy size and stellar mass,such that galaxies with high stellar surface mass density are older, moremetal-rich and alpha-enhanced than less dense galaxies. Galaxies with highsurface mass densities have a very narrow range of metallicities, however, atfixed mass, the spread in metallicity increases substantially with increasinggalaxy size (decreasing density). We identify residual correlations withmorphology and environment. At fixed mass and size, galaxies with late-typemorphologies, small bulges and low Sersic n are younger than early-type, highn, high bulge-to-total galaxies. Age and metallicity both show small residualcorrelations with environment; at fixed mass and size, galaxies in denserenvironments or more massive halos are older and somewhat more metal rich thanthose in less dense environments. We connect these trends to evolutionarytracks within the size--mass plane.

The SAMI Galaxy Survey: Global stellar populations on the size-mass plane