Robust electrode technology is essential to address the growing demand for neural devices for sensing and stimulation in the central and peripheral nervous system. Difficulties remain in device performance, mechanical integrity and stability. Conductive diamond is highly promising to overcome these obstacles, and provides the opportunity to integrate sensing and stimulation in the same robust device. This presentation focuses on our diamond-film electrode development and application for neurosensing and for stimulation of neural activity. Unique fabrication and materials integration approaches have been used to obtain diamond electrodes in a flexible construct; one example is diamond-on-polymer electrode arrays.