During the course of a continuing phytochemical survey of Brazilian Velloziaceae, we examined a sample of Vellozia caput-ardeae L. B. Smith & Ayensu collected in Diamantina, State of Minas Gerais, Brazil. Chromatographic fractionation on silica gel of the hexane extract from the plant's stem, roots, and leaf sheaths yielded two crystalline compounds, which were identified as two new kaurene-type diterpenes: 12β-hydroxy-9,11-dehydrokaurene (1) and 12-oxo-9,11-dehydrokaurene (2). The structures of these compounds were elucidated using spectral data including mass spectrometry (MS), infrared spectroscopy (IR), ¹H nuclear magnetic resonance (¹H NMR), and ultraviolet spectroscopy (UV). Additionally, compound 1 was oxidized with pyridinium chlorochromate to yield compound 2, which was also isolated from the plant, confirming their structural relationship.