LTSR may refer to:
- London, Tilbury and Southend Railway, a railway line from London to Southend in England.
- LTS Rail, a post-privatisation train operating company, later renamed c2c.
- The Lithuanian Soviet Socialist Republic (in Lithuanian: Lietuvos Tarybų Socialistinė Respublika).
- Lone Tree Scout Reservation
- Long-Term Service Release - infrequent updates to supplied software, with only essential low-risk changes, that gives minimum disruption to organisations that don't want the effort, cost and risk of frequent updates.
This disambiguation page lists articles associated with the title LTSR.
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