The synthesis of complex transition metal oxides using molecular beam epitaxy is well established with the exception of gold. Overcoming the oxophobicity of gold is a mandatory step towards an entire new section of complex transition metal oxides. Here, we show that ${\mathrm{Sr}}_{5}{\mathrm{Au}}_{2}{\mathrm{O}}_{8}$ thin films can be epitaxially grown onto ${\mathrm{SrTiO}}_{3}$ substrates using a high-efficiency radio-frequency-operated atomic oxygen source as an oxidizing agent. Stoichiometric atomic beam fluxes of strontium and gold were controlled by electron-impact emission spectroscopy. ${\mathrm{Sr}}_{5}{\mathrm{Au}}_{2}{\mathrm{O}}_{8}$ thin films were grown at temperatures between 627 and 653 ${}^{\ensuremath{\circ}}\mathrm{C}$. Owing to the sensitivity of ${\mathrm{Sr}}_{5}{\mathrm{Au}}_{2}{\mathrm{O}}_{8}$ thin films to environmental agents, e.g., water and ${\mathrm{CO}}_{2}$, we capped them with a 300-nm layer of Se or a 200-nm layer of Au.