The Holy Spirit Adoration Sisters are a Roman Catholic religious institute of cloistered nuns.
The nuns live a contemplative life, focused on perpetual adoration of the Blessed Sacrament, offering intercessory prayers for the world. Inside the cloister the nuns wear rose-colored habits in honor of the Holy Spirit. As a consequence of these habits those nuns are nicknamed the "Pink Sisters."
The congregation was founded in 1896 in the Netherlands by Saint Arnold Janssen, a German diocesan priest who had first founded in 1875 the Society of the Divine Word and in 1889 the Missionary Sisters Servants of the Holy Spirit. Janssen was canonized on October 5, 2003, by Pope John Paul II. The first house was established in Pennsylvania, United States in 1915 by Mother Mary Michael (Adolfine Tönnies) (1862 - 1934), upon the invitation of Archbishop Edmund Francis Pendergast.
Currently, there are 22 Houses located in Argentina, Brazil, Chile, Germany, India, Indonesia, the Netherlands, the Philippines, Poland, Slovakia, Togo, and the United States.