Harriet Spiller Daggett, Professor Emeritus (August 5, 1891—July 22, 1966) was an academic, lawyer, schoolteacher and law professor in Louisiana.
She was one of the first female members of a law faculty in the US.
In 1931, she became the first woman to become a full professor of law at an ABA-approved, AALS-member college, two years before Barbara Nachtrieb Armstrong at the University of California, Berkeley; a third female tenured law professor was not appointed until Margaret Harris Amsler at Baylor University Law School in 1941.