Sir Narcisse-Fortunat Belleau KCMG QC (October 20, 1808 – September 14, 1894) was a Canadian politician who served as the first Lieutenant Governor of Quebec.

He became premier for Canada East and receiver general in 1865 on the death of Sir Étienne-Paschal Taché and served in that role until Confederation.

He was nominated for a seat in the Senate of Canada in 1867 but withdrew when he was named the first Lieutenant Governor of Quebec in July of the same year.

After politics, Belleau continued to sit on the board of the Quebec Bank and took an active role in social functions.

In The Queen v Belleau, the Judicial Committee held that by the terms of the statute, the federal government was not liable for either principal or interest.