Alphonse 'Aly' Jaerling (born 30 January 1948 in Esch-sur-Alzette) is a Luxembourgish politician. He sat in the Chamber of Deputies from 1999, when he was first elected for the Alternative Democratic Reform Party (ADR) until 2009.^[1] He is also a member of Esch-sur-Alzette's communal council (1993 – 1999, 2000 – ).^[1]

Jaerling left the ADR on 1 May 2006, protesting at the shift in the party's emphasis away from pension reform, which had originally been the ADR's raison d'être, and decrying the 'nationalism' espoused by the party.^[2] The party had recently renamed itself from 'Action Committee for Democracy and Pensions Justice', a name that it had borne since 1992, as part of its gradual metamorphosis from a single-issue party to one of the established parties. However, Jaerling's departure dealt the party a major blow, reducing the party's deputation in the Chamber of Deputies to four seats, ending its qualification as a party caucus (it qualifies now only as a 'group'), and calling into question the party's future.^[3]

In the 2009 election, Jaerling ran for the Citizens' List, heading the list in Sud. The party came last of the eight parties running, and Jaerling was not elected.