The complex oxide IrO₂ is predicted to be a dirac nodal line semimetal protected by nonsymmorphic symmetry. Some of its intriguing physical properties include a large spin hall effect, significant magnetoresistance, and a hall effect where the sign of the carrier may be controlled by an external magnetic field. Previously there has been no direct evidence of the topological features of the band structure. This is a non trivial prediction because the relevant orbitals Ir 5d and O 2p are known to often host strong electron correlations and spin orbit coupling. Using a combination of reactive oxide molecular beam epitaxy and Angle-Resolved Photoemission Spectroscopy we show that IrO₂ is a Dirac nodal line semimetal in agreement with the predictions of Sun et. al. This is the first experimental observation of nodal lines protected by nonsymmorphic symmetry. Significantly the crossing points are protected even in the case of large spin orbit coupling characteristic of iridates. Furthermore they cross the fermi level making IrO₂ an ideal system to study the low energy properties of Dirac nodal line materials.