Boyd, 22, of Johnston County, was first charged along with his father Daniel Boyd, his brother Dylan and four other suspects - Anes Subasic, Hysen Sherifi, Mohammad Hassan and Ziyad Yaghi - in a plot to support terror overseas.
Prosecutors say Boyd conspired with the other named defendants and others to provide material support and resources to terrorists, including currency, training, transportation, and personnel.
"With his plea today, Zakariya Boyd will be held accountable for his role in this conspiracy to provide material support to terrorism. This case is yet another example of an individual who joined the terrorist cause from within our borders and underscores the dedication of prosecutors, analysts and agents at all levels of our government who work tirelessly to identify such individuals and bring them to justice," said Acting Assistant Attorney General Hinnen.
At sentencing, Boyd faces a potential 15 years in prison followed by three years of supervised release for conspiring to provide material support to terrorists.
Boyd's father pleaded guilty in February to one count of conspiracy to provide material support to terrorists and one count of conspiracy to murder kidnap, maim and injure persons in a foreign country.
Trial for the remaining co-defendants in custody is scheduled for September.