The Missionary Sisters of the Immaculate Conception of Mary is an international religious congregation founded by St. Carmen Sallés in 1892, in Burgos, Spain. For over 133 years, the Sisters have faithfully dedicated themselves to the service of humanity through the holistic education of children and youth across various countries around the world. Their missionary journey in the Philippines began in 1986, with the establishment of their first house in Manila, where they built a dormitory for young university women. In 1996, the Sisters extended their mission to Bacolod, Negros Occidental, where they constructed another dormitory for female university students. In 2002, they founded the Blessed Carmen Sallés School, initially offering Pre-School and Elementary education. Following the canonization of their Mother Foundress on October 21, 2012, the school was renamed St. Carmen Sallés School in 2013 to honor her sainthood. The school achieved another milestone in School Year 2014–2015 with the opening of the Junior High School, followed by the introduction of the Senior High School in School Year 2017–2018. In 2017, the school celebrated its 15th founding anniversary, which coincided with the 125th anniversary of the Congregation. In 2018, the Sisters inaugurated a new branch in Quezon City, offering Kindergarten education. This was followed by the establishment of St. Carmen Sallés School – Cavite in 2019, located in General Trias City, which began offering Pre-Kindergarten and Kindergarten programs. The school has since expanded to include Elementary education and is set to open its Junior High School level in School Year 2025–2026, with plans to offer Senior High School in the coming years. Through these developments, the Missionary Sisters continue to live out their charism of providing a faith-based, liberating, and transformative education inspired by the values and vision of St. Carmen Sallés.