This study raises the issue of 1) Is there an influence of organizational culture on the optimism of high school teachers in Bagan Sinembah District, Rokan Hilir? 2) Is there an effect of the work environment on the optimism of SMA teachers in Bagan Sinembah District, Rokan Hilir? 3) Do organizational culture and work environment together influence the optimism of high school teachers in Bagan …