Native Americans' Day is a holiday in the state of South Dakota in the United States of America, aimed at honoring the cultural contributions of Native American communities to the various aspects of American society. The holiday underscores the need to preserve, promote, and reflect upon the historical, cultural, and societal role that Native Americans played in shaping the nation. South Dakota replaced Columbus Day with Native American Day in 1990, becoming the first state to establish an official state holiday on this day.

Many activities arranged during this holiday engage in the celebration of the rich and diverse cultures, traditions, histories, and significant contributions made by Native Americans. These activities include traditional tribal rituals, dance and music performances, art exhibits, and educational events. It presents a unique opportunity for native and non-native people to share and learn from each other, bringing cultures together to inspire understanding and respect towards Native American heritages.

Native Americans' Day encourages younger generations to delve deeper into the understanding of Native Americans’ unique cultural practices, values, and languages, vital for their preservation and continuity. It implies supporting and practicing tolerance and collaboration between all communities within America. South Dakota prides itself in being the 'Mount Rushmore State,’ a leader in acknowledging the importance and influence of its native populace, highlighting it prominently through the observance of this holiday.