Colour is one of the significant design elements that should be considered by designers during design. The purpose of this study is to investigate the impact of four distinct interior colour schemes on undergraduate students' moods. The range of colours investigated was based on four tints of various hues that would be realistically used in painting interiors different hues. A sample of students majoring in interior design from (Oman College of Management and Technology) responded to an online questionnaire examining the colours selected and their impact on their moods. Anxiety, tension, anger, focus, learning more and relaxation are the impressions and moods investigated in the questionnaire. The analysis of the data collected shows that Bright Green had fewer responses than Orange Yellow for all emotions. The findings also confirmed the idea that red colour is responsible for evoking negative feelings including rage, tension, exhaustion, and others. It was found that blue colour, would be used efficiently to design interior spaces for people who face negative energy to boost their feelings. This study is believed will be supportive of interior designers, and architects using colour in their design processes.