A religious order formed by the union of several monastic societies following the Rule of Saint Augustine, in imitation of the monastic community established by Saint Augustine of Hippo among his clergy in 391. The original branches were

* Williamites
* Bonites
* Brittinians
* Hermits of the Holy Trinity in Tuscany
* other houses in Italy

These were united in 1256 through the efforts of Pope Alexander IV, and monasteries were soon established in Germany, France, and Spain. At the period of its greatest prosperity, in the 15th century, the Order had 42 provinces and two vicariates numbering 2,000 monasteries and about 30,000 members.

Several reformed congregations known as “Regular Observants” were instituted about this time. The most important of these were the Hermits Recollects of Saint Augustine, a reform begun in Spain in 1438, established in 1588, and formed into a distinct order in 1912, and the German or Saxon Reformed Congregation, recognized in 1493 and comprising many important convents in Germany afterwards affiliated with the Lombardic Congregation. Augustinians were established in the United States in 1796.

After the 16th century the Order lost numbers of monasteries as a result of the Reformation. Most of the French houses were destroyed during the French Revolution, losses resulted from the secularization of religious houses in Germany, Austria, and Italy, and in 1835 nearly all the houses in Spain were suppressed. The Philippines also suffered losses due to the political disturbances of 1896, and the Order was suppressed in 1864 in Russia and in 1860 in Mexico where it was later re-established though suppressed with other religious in 1926.

The work of the order is cure of souls, including missions, and the advancement of learning through teaching and scientific study. They conduct academies, colleges, seminaries, and missions in Italy, Spain, Netherlands, Belgium, Germany, Czech Republic, Malta, England, Ireland, Australia, China, Philippines, Colombia, Peru, Brazil, Argentina, Ecuador, Chile, Cuba, and the United States. The general mother-house is in Rome, Italy. Monasteries of women following the Rule of Saint Augustine have existed as independent communities since the 11th century. In 2004 there were over 2,800 members of the Order, over 2,100 of them priests.

Feast Day
Angelo FurciBlessed(1246-1327)02/06
Alonso de OrozcoSaintPriest (1500-1591)09/19
Alypius of ThagasteSaintBishop (late 5th Century)05/16
Andrew of MonterealeBlessed(1397-1480)04/18
Angelo Conti of FolinoBlessed(1256-1312)090/6
Angelo Scarpetti of San SepolcroBlessed(mid-13th Century)10/03
Anselm PolancoBlessed(1881-1939)02/77
Anthony della TorreBlessed(1427-1494)07/24
Anthony of AmandolaBlessed(1355-1460)01/29
Anthony PatriziBlessed(early 13th Century)10/09
AugustineSaintBishop and Doctor (354-430)08/28
Augustine of TaranoBlessed(d.1390)05/19
The Augustinian Martyrs of JapanMartyr(early 17th Century)09/28
Cherubin Testa of AviglianaBlessed12/16
Christine of L'AquilaBlessed(1480-1543)01/18
Christine of S. Croce sull'ArnoBlessed01/04
Christine of SpoletoBlessedAugustinian Laywoman02/13
Clare of the Cross of MontefalcoSaintVirgin (1268-1308)08/17
Clement of OsimoBlessed(d. 1291)05/19
Elias del Socorro NievesBlessedPriest, Martyr (1882-1928)10/11
Ezekiel MorenoSaintBishop (1848-1906)08/19
Frederick of RegensburgBlessedReligious ( - 1329)11/29
FulgentiusSaintBishop (462-527)01/03
Gonzalo of LagosBlessedPriest (1360-1422)10/14
Gratia of KotorBlessedReligious (1438-1508)11/07
Gregory CelliBlessed(1225-1343)05/11
Helen of UdineBlessedAugustinian Laywoman (1396-1458)04/23
James of CerquetoBlessed(approx. 1284-1367)10/31
James of ViterboBlessedBishop (1255-1307)12/12
Jerome of RecanatiBlessed(d. 12 March 1350)03/12
John and Peter Bechetti of FabrianoBlessed(d. 13th Century)07/02
John the GoodBlessedReligious10/23
John of RietiBlessedReligious (1299-1316)08/02
John of SahagunSaintPriest (1430-1479)06/12
John StoneSaintMartyr ( - 1539)10/25
Josephine Mary of Saint AgnesBlessed(1625-1694)01/23
Julia of CertaldoBlessedSecular (1319-1370)02/15
Lucy Bufalari of AmeliaBlessed(d. 1350)07/27
Magdalene AlbriciBlessedVirgin (1415-1465)07/17
Magdalene of NagasakiSaintvirgin, martyr (1611-1634)10/20
Fr. Mariano de la Mata Aparicio, O.S.A.Blessed(1905-1983)04/05
Maria Terese FasceBlessedreligious10/12
Marie Catherine of Saint AugustineBlessed(1632-1668)05/08
Martin of Saint Nicholas and Melchior of Saint AugustineBlessed12/11
The Martyrs of GafsaMartyrs08/26
Monica, Mother of AugustineSaint(331-385)08/27
Nicholas of TolentineSaintPriest (1250-1305)09/10

Peter of GubbioBlessed(d. 1306-1322)10/29
Peter of FriedhofenBlessed(1819-1860)06/23
Peter James of PesaroBlessed(d. 1496)06/25
Philip of PiacenzaBlessed(d.1306)06/20
Possidius of CalamaSaintBishop (late 5th Century)05/16
Rita of CasciaSaintReligious (1380-1456)05/22
Sante of CoriBlessedmid-14th Century-139210/05
Simon of CasciaBlessedPriest (1295-1348)02/16
Simon of TodiBlessed(d. 1322)04/20
Stephen BellesiniBlessedPriest (1774-1840)02/03
Thomas of VillanovaSaintBishop and Patron of Studies in the Order (1486-1555)10/10
Ugolindo of Gualdo CattaneoBlessed(early 13th Century-1260)01/08
Ugolino ZefferiniBlessed(1320-1367)03/22
Veronica of BinascoBlessed(1445-1497)01/13
William TirreyBlessedMartyr (1608-1654)05/12
William of ToulouseBlessed(1297-1369)05/18
William the HermitSaintReligious (12th Century)10/23