Assagay, also spelt Assegay, is a suburb of eThekwini in KwaZulu-Natal, South Africa and forms a part of the Upper Highway Area.

Large secure gated estates such as Queensbridge, Silver Oaks, Highmead and the nearby Aintree Lane residential development at Shongweni surrounding the Assagay Hotel (previously known as the Polo Pony Hotel) have seen the character change to more of a high-income area.

The Assagay valley forms the original catchment area of the Umhlatuzana river which flows through the Madwala Reserves.

Working for Water has made a contribution towards clearing the area of invasive plants and continues to eradicate all alien flora with the cooperation of landowners.

The Voortrekkers having named the early farms in their Natalia Republic (Natal) after settling throughout the area in 1839 after defeating the Zulu king Dingane.