[en] Because observations of the Kleinmann--Low region of the Orion Nebula reveal significant polarization in the wavelength range from 1 to 13 micrometers, polarization at wavelengths greater than 15 micrometers were investigated. Far infrared polarization measurements were made of a number of sources using an instrument mounted at the bent Cassegrain focus of the Kuiper Airborne Observatory's 90 cm telescope. About two hours of data were obtained on the Orion Nebula on each of two flights, and more careful calibration on Jupiter (assumed to be unpolarized) were obtained on both nights. The data on Orion and Jupiter for three filters are presented. Possible explanations are suggested for reconciling the high polarization observed by others in 1974 with the lower values obtained in this study