QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21.1

List of Subsidiaries of Lone Pine Resources Inc.

Name of Subsidiary	Jurisdiction of Incorporation or Organization
Wiser Oil Delaware, LLC	Delaware
Wiser Delaware LLC	Delaware
Lone Pine Resources Canada Ltd.	Alberta
Lone Pine Resources (Holdings) Inc.	Alberta

QuickLinks

Exhibit 21.1

List of Subsidiaries of Lone Pine Resources Inc.