Observations of the sodium tail of comet Hale-Bopp (C/1995 O1) were made with the Midcourse Space Experiment (MSX) satellite near perihelion. Observations of the dust continuum, H2O+ emissions, and sodium tail are reported. The measurements show the Na tail to be diffuse and located between the dust and ion tails. The midrange spatial scale of the MSX measurements (104 to 106 km) is complementary to the high spatial resolution measurements of Brown et al. (submitted to Icarus, 1997) and large-scale measurements of Cremonese et al. [1997>, less than 104 km and greater than 3.5¿106 km, respectively. The primary Na source appears to be from the inner coma and nucleus region. The observations are fit with a sodium point source model affected only by radiation pressure to obtain excellent agreement. ¿ 1998 American Geophysical Union