| Type: | Cardinal |
| Honorific Prefix: | His Eminence |
| Achille Locatelli | |
| Cardinal-Priest of San Bernardo alle Terme | |
| Church: | Roman Catholic Church |
| Appointed: | 25 May 1923 |
| Term End: | 5 April 1935 |
| Predecessor: | Giovanni Cagliero |
| Successor: | Alfred-Henri-Marie Baudrillart |
| Other Post: | Camerlengo of the College of Cardinals (1933–35) |
| Ordination: | 20 December 1879 |
| Consecration: | 27 December 1906 |
| Consecrated By: | Rafael Merry del Val y Zulueta |
| Cardinal: | 11 December 1922 |
| Created Cardinal By: | Pope Pius XI |
| Rank: | Cardinal-Priest |
| Birth Name: | Achille Locatelli |
| Birth Date: | 15 March 1856 |
| Birth Place: | Serengo, Milan, Kingdom of Lombardy–Venetia |
| Death Place: | Rome, Kingdom of Italy |
Achille Locatelli (15 March 1856 in Seregno, Milan, Italy – 5 April 1935 in Rome) was a Roman Catholic cardinal. He worked in papal diplomacy, and among other positions, he was nuntius in Argentina, Paraguay, and Uruguay.
He was named Apostolic Nuncio to Belgium on 8 July 1916.[1]
He was appointed Apostolic Nuncio to Portugal on 18 July 1918.[2]
He was made cardinal in 1922 by Pope Pius XI.[3]