Trifurcula sanctaecrucis is a moth of the Nepticulidae family. It is endemic to the Canary Islands. The larvae feed on Lavandula canariensis. They mine the leaves of their host plant. The mine consists of a gallery, alternating between upper-surface and lower-surface. The frass is deposited in an almost continuous line that leaves a clear margin at either side. The rind of the stem may also be mined in young shoots.