An aegis ( /ˈiːdʒɨs/; from Greek αιγίς) is a large collar or cape worn in ancient times to display the protection provided by a high religious authority or the holder of a protective shield signifying the same, such as a bag-like garment that contained a shield. Sometimes the garment and the shield are merged, with a small version of the shield appearing on the garment. It originally was derived from the protective shield associated with a religious figure when related in myths and images. The wearing of the aegis and its contents show sponsorship, protection, or authority derived from yet a higher source or deity. The name has been extended to many other entities, and the concept of a protective shield is found in other mythologies, while its form varies across sources.

Now, the more modern concept of doing something "under someone's aegis" means doing something under the protection of a powerful, knowledgeable, or benevolent source. The word aegis is identified with protection by a strong force with its roots in Greek mythology and adopted by the Romans; there are parallels in Norse mythology and in Egyptian mythology as well, where the Greek word aegis is applied by extension.

Aegis is a band in the Philippines. Their successful singles include "Luhà" ("Tears"), "Halík" ("Kiss"), and "Basáng-basâ sa Ulán" ("Drenched in the Rain").

Aegis has released 40 albums over its career that have consistently made the Gold and Platinum marks beginning with Halik, Mahal na Mahal Kita, Awit at Pag-Ibig, Paskong-Pasko and Ating Balikan. They also released a mind-boggling remix collection of Aegis' hits entitled Ating Sayawin. The band is also responsible for hits such as "Luha" and "Halik".

Sisters Juliet and Mercy Sunot have been with the group since they started originally as AG's Soundtrippers (the letters A and G being their manager's initials). They later changed into Aegis in 1998 as agreed upon by the band manager & Alpha Records. Apart from the two sisters, keyboardist Stella Galindo is also the sister of the band's manager Lito, while his (Lito's) wife, Josie, is Rey's sister.