Harald Nugiseks (22 October 1921 – 2 January 2014) was an Estonian serviceman in the Waffen-SS of Nazi Germany during World War II.

Harald Nugiseks was born on Vanaõu farmstead, Karjaküla village, Järva County, Särevere Province, Estonia.

Nugiseks became part of 185th battalion of General Georg von Kuchler's 18th Army officially known as Estniche Sicherungs Abteilung which was used as a security unit in the rearguard.

As the I Battalion, Waffen-Grenadier Regiment der SS 46, lost almost all of its officers, Nugiseks stepped in as the leader of the attack.

Unterscharfuhrer Nugiseks was only 22 years old leading a Zugfuhrer (platoon leader) of Estonians defending the homeland against invasion for his unit I.46.

On 21 February 1994, service to his country was recognised when Major-General Aleksander Einseln made Nugiseks a Retired Captain (erukapten) of the Estonian Defence Forces.

After 4229 signatures were collected in October 2008, Captain Nugiseks was awarded the Medal of Gratitude by the people of Estonia for his part in the fight against Bolshevism.