Bilimbia is a genus of lichen-forming fungi in the family Ramalinaceae. The genus forms crustose (crust-like) lichens that appear as whitish-grey to grey patches on calcium-rich soils or mosses growing over alkaline surfaces. The genus is distinguished by its sessile apothecia (fruiting bodies) that range from light ochre to black, eight-spored asci, and colourless spores with multiple cross-walls. Molecular phylogenetics studies have confirmed that Bilimbia forms a well-supported monophyletic group within the Ramalinaceae, and as of 2025, it contains 24 accepted species.

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