From 1962 to 1965, Moawad worked as a journalist for the daily newspaper, L'Orient. In 1965, she married René Moawad, surprising many people since he was the scion of a rival clan, who was fifteen years her senior. Despite the disparity in their ages, and despite the traditional antagonism between their families, the marriage was a happy one and produced two children. Rima, a lawyer and a graduate of Harvard University, and Michel, also a lawyer and businessman, who graduated from Sorbonne University in Paris.
Moawad became a member of the National Assembly in 1991, representing the Zgharta-Tripoli constituency in northern Lebanon. She served on numerous parliamentary committees, specializing in such diverse fields as finance, children's rights, and education. She campaigned strongly for women's and children's rights, and opposed political corruption. She is a prominent member of the Qornet Shehwan Gathering, a coalition of Christian parliamentarians which opposed the Syrian military presence in Lebanon and continues to campaign for the building of a modern, democratic nation state. She is also a member of the Democratic Forum, a coalition comprising both Christian and Muslim parliamentarians opposed to the pro-Syrian government. She has also been affiliated with the National Front, a multi-sectarian parliamentary block working for political reforms. In the general election held in May–June 2005, she retained her seat. In 2004, Moawad announced her candidacy for the presidency in elections scheduled to be held that year. These were postponed, however, until 2007. Moawad's son, Michel, founded a new political party in 2006 called Independence Movement. The movement is part of the anti-Syrian Qornet Shehwan Gathering and the March 14 Alliance. During the period between 2005 and 2009 it had 3 Maronite Christian MPs for the Zgharta District in the Lebanese Parliament, namely Nayla Moawad, Jawad Simon Boulos and Samir Frangieh. Since 2009, the party has been led by Michel René Moawad, Jawad Simon Boulos and Youssef Bahaa El Douaihy. In the 2009 Lebanese elections, Moawad decided not to run for a seat in her district. She instead encouraged and supported the election of her son Michel. He and the Independence Movement's other two candidates in the district lost to their opponent Suleiman Frangieh and his coalition. Nayla Moawad still remains a strong anti-Syrian lobbyist and is still a member of the 14 March Movement.