Thera is a genus of moths of the family Geometridae erected by James Francis Stephens in 1831.

• Thera britannica (Turner, 1925) – spruce carpet
• Thera cembrae (Kitt, 1912)
  • Thera cembrae cembrae (Kitt, 1912)
  • Thera cembrae mugo Burmann & Tarmann, 1983
• Thera cognata (Thunberg, 1792)
  • Thera cognata cognata (Thunberg, 1792)
  • Thera cognata geneata (Feisthamel, 1835)
• Thera contractata (Packard, 1873)
• Thera cupressata (Geyer, 1831)
• Thera firmata (Hübner, 1822)
  • Thera firmata consobrinata Curtis, 1834
  • Thera firmata firmata (Hübner, 1822)
  • Thera firmata tavoilloti Mazel, 1998
• Thera juniperata (Linnaeus, 1758) – juniper carpet
• Thera latens Barnes & McDunnough, 1917
• Thera obeliscata (Hübner, 1787)
• Thera otisi (Dyar, 1904)
• Thera ulicata (Rambur, 1934)
• Thera variata (Denis & Schiffermüller, 1775)
  • Thera variata balcanicola de Lattin, 1951
  • Thera variata variata (Denis & Schiffermüller, 1775)
• Thera variolata (Staudinger, 1899)
• Thera vetustata (Denis & Schiffermüller, 1775)

• Thera on Fauna Europaea