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The incorporation of various openings that permit daylight into interior spaces significantly influences thermal comfort. In the central region of Iran, Orosi windows are a prevalent architectural feature in courtyard buildings. These latticed door-windows are embellished with colorful glass pieces arranged in geometric patterns. This study aims to evaluate the impact of glass color in Orosi windows on their thermal and daylight performance. The primary objective is to determine the thermal comfort and daylight performance of a typical Qajarian Orosi with different glass colors (colorful, red, blue, yellow, green, colorless) and to identify the optimal glass color for Orosi windows. The findings reveal that the glass color of Orosi windows not only affects thermal comfort but also has a significant impact on daylight performance. Yellow glass offers the most favorable thermal conditions, irrespective of the season. In terms of daylight performance, all glass colors perform adequately; however, the Orosi with yellow glass achieves the highest values for spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE). The next preferred options, in descending order, are colorless, green, and blue glass. Considering both daylight and thermal performance, it is recommended to use Orosi windows with yellow glass due to the 22% improvement in annual thermal comfort and satisfactory daylight performance. [ABSTRACT FROM AUTHOR]