High-pressure melting, phase transitions and structures of iron have been studied to 84 GPa and 3500 K with an improved laser heated diamond anvil cell technique and in situ high P-T x-ray diffraction. At pressures below 60 GPa, the lower bound on the melting curve is close to those measured by Boehler [1993> and Saxena et al. [1993>; however, at pressures above 60 GPa our data indicate melting at higher temperatures than these studies, but still lower than the melting curve of Williams et al. [1990>. The &egr;-&ggr;-l triple point is 60(¿5) GPa and 2800(¿200) K, based on our data of the &egr;-&ggr; phase transition and the observation of melting by in situ x-ray diffraction. No solid phases other than &egr;-Fe and &ggr;-Fe were observed in situ at high temperatures (>1000 K) and pressures to 84 GPa. However, the diffraction patterns of temperature quenched products at high pressure can be fit to other structures such as dhcp. ¿ 1998 American Geophysical Union