407 members of the House of Representatives, including Ms Omar, supported the resolution, while 23 opposed it.
Opposition Republicans had seized on her remarks as a sign that her party has become fractured, but Democratic House speaker Nancy Pelosi told reporters that she believed Ms Omar had not understood the “weight of her words”.
The seven-page resolution passed on Thursday evening says that “whether from the political right, center, or left, bigotry, discrimination, oppression, racism, and imputations of dual loyalty threaten American democracy and have no place in American political discourse”.
Ms Omar previously apologised for suggesting money was the reason why the United States was a strong supporter of Israel.