Tau Gamma Sigma (ΤΓΣ) also known as the Triskelions' Grand Sorority, is a sorority established in the Philippines. Its members call themselves Lady Triskelions. The sorority encourages its members to strive for spiritual growth and to organize socio-civic activities for the benefit of communities. It is now one of the largest and most dynamic sororities in the Philippines. Its counterpart is called Tau Gamma Phi (ΤΓΦ) also known as the Triskelions' Grand Fraternity.