Catholic Mariology is the systematic study of the person of Mary, the Mother of Jesus, and of her place in the Economy of Salvation in Catholic theology. According to the doctrine of the Immaculate Conception taught by the Catholic Church, Mary was conceived and born without the stain of original sin from the sin of Adam and Eve, meaning she was saved by God in the moment of her conception, and she is also known as the "New Eve", hence she is seen as having a singular dignity above the saints, receiving a higher level of veneration than all angelic spirits and blessed souls in heaven. Catholic Mariology thus studies not only her life but also the veneration of her in daily life, prayer, hymns, art, music, and architecture in modern and ancient Christianity throughout the ages.

The four Marian dogmas of Mary's Divine Motherhood or being the Mother of God also known as the Theotokos (Θεοτόκος) in Greek, Her Immaculate Conception (having no stain of original sin), Her Perpetual Virginity, and the Assumption of Mary into Heaven form the basis of Mariology. However, a number of other Catholic doctrines about the Virgin Mary have been developed by reference to Sacred Scripture, theological reasoning and church tradition. The development of Mariology is ongoing and since the beginnings it has continued to be shaped by theological analyses, writings of saints, and papal statements, e.g. while all four of the dogmas are ancient in their origin, two were not defined until the 19th and 20th centuries; and papal teachings on Mary have continued to appear in recent times.

In parallel to the traditional views, since the late 19th century, as Marian devotion became more pronounced in the Catholic Church, a number of other perspectives have been presented as a challenge to Catholic Mariology. Some other Christian views see Catholic Mariology as unbiblical and a denial of the uniqueness of Christ as redeemer and mediator, and some modern psychological interpretations see Mary as similar to polytheistic goddesses ranging from Diana to Guan Yin. Nonetheless, Christians in the Catholic Church, the Old Catholic Churches, the Eastern Orthodox Church, the Oriental Orthodox Church, the Assyrian Church of the East, the Ancient Church of the East, the Independent Sacramental Movement, Anglo-Catholicism, and other High church Protestants continue to revere Mary as the greatest saint.

The study of Mary and her place in the Catholic Church has been undertaken from a number of perspectives and within a number of contexts, and in his address to the 2012 Mariological congress, Pope Benedict XVI stated that this study must be "understood and deeply examined from different and complementary viewpoints". Benedict also emphasized that the study of Mary cannot be performed in isolation from other disciplines and that Mariology is inherently related to the study of Christ and of the church, and expresses the inner coherence of these disciplines.

Pope Benedict XVI has stated that Marian studies have three separate characteristics: first personalizing the church so it is not seen just as a structure but as a person, secondly the incarnational aspect and the relation to God, and third Marian piety which involves the heart and the emotional component.

Mary's position in the church can be compared to the aspect of the Petrine office in a dual sense. This perspective on the duality of the roles of Mary and Peter highlights the subjective holiness of the heart and the holiness of the structure of the church. In this duality, the Petrine office logically examines the charisms for their theological soundness, while the Marian dual provides a balance in the spiritual and emotional sense via the service of love that the office can never encompass. Mariology and the doctrine of office are thus not "side chapels" in Catholic teachings, but are central and integrating elements of it. As referenced in Pope Pius XII's 1943 the encyclical Mystici Corporis Christi, her fiat gave consent for a spiritual marriage between the Son of God and human nature, thus giving humanity the means to salvation. Mary's rights (wedding feast at Cana), and Mary's love (fiat) are essential to salvation.

Mariology is a field in which deeply felt pious beliefs of the faithful and hagiography may conflict with theological and critical historical reviews of beliefs and practices. This conflict was recognized as early as the year 1300 by William of Ware who described the tendency of some believers to attribute almost everything to Mary. Bonaventura warned against Marian maximalism: "One has to be careful as to not to minimize the honour of our Lord, Jesus Christ." Both minimalist and maximalist have always seen in Mary a sign of the Catholic Church and viewed her as a model for all Catholics.

In the 20th century, Pope Pius XII, "the most Marian pope in Church history", warned against both exuberant exaggerations and timid minimalism in the presentation of Mary. The Vatican II dogmatic constitution Lumen gentium was specifically written in 1964 to avoid both Marian maximalism and minimalism. Pope John Paul II was also careful to avoid both maximalism and minimalism in his Mariology and avoided taking personal positions on issues which were subject to theological debate.