Saint Elena Guerra, OSS (23 June 1835 – 11 April 1914) was an Italian Catholic religious sister who founded the Oblates of the Holy Spirit.

[1] Guerra studied French as well as music and art but also learnt Latin and the lives and works of the Church Fathers during an illness that spanned from 1857 to 1864 as she could not leave the house because of it.

In 1866 she established a lay association dedicated to the education of girls under the patronage of Our Lady, St. Joseph and the patroness of Lucca, St. Zita[2] One of her students was Gemma Galgani.

Guerra and her father made an Easter pilgrimage there in April 1870 and visited the tomb of Saint Peter before she was able to meet with the pope on 23 June 1870.

[3] In August 1906 the Archbishop of Lucca told her that he would not permit her prospective religious to make their vows unless Guerra resigned as the congregation's leadership.

[1] Pope Pius X issued a pontifical decree of coronation on 9 September 1904 granted to Elena Guerra to impose a diadem of stars for the venerated image of the Blessed Virgin of the Immaculate Conception enshrined within their monastery for the 50th Anniversary of the Marian Jubilee of 1904 .

The miracle was soon approved (after passing several boards) and allowed for Pope John XXIII to celebrate her beatification on 26 April 1959 in Saint Peter's Basilica.

On April 13, 2024, Pope Francis met in audience with the cardinal Marcello Semeraro, prefect of the Dicastery for the Causes of Saints, and recognized the miracle necessary for Guerra's canonization.