This research was aimed to analyze the comparison of NOAA-11/AVHRR LST Algorithm and MODIS LST data. The LST Algorithm of AVHRR/NOAA was developed by Rustana using a split-window method of thermal infrared channels 4 and 5 which was validated using Australian LST ground measurement. The algorithm will be applied to the MODIS thermal infrared of channels 31 and 32 data in order to determine the LST. This LST measurement will be comparatively analyzed with direct LST measurement of MODIS using the Python and Origin Pro software. The result indicated that the LST algorithm measurement of the first and second-order was linearly the best fit with the LST measurement of MODIS data using Python and Origin Pro Software with an accuracy of about 1.65 °C and 1.29 °C. It can be concluded that the developed LST Algorithm of AVHRR/NOAA can be applied to measure LST in Indonesia.