Crown rot may refer to:
- Crown rot (phytophthora blight) is an oomycete pathogen of peppers, Cucurbits and tomatoes
- Crown rot (Rhizoctonia solani) is an infection of several plant species referred to as crown rot in carrots.
- Crown rot (sclerotinia rot) is a fungal rot causing damp patches and white mould and small black spores on a wide variety of plants.