C. maritima may refer to: * Cakile maritima, the European searocket, a common plant species * Calendula maritima, the sea marigold, a very rare plant species * Calidris maritima, the purple sandpiper, a small shorebird species * Cicindela maritima, a ground beetle species native to Europe * Coreopsis maritima, the sea dahlia or beach coreopsis, a plant species * Crambe maritima, the sea kale, a halophytic perennial plant that grows wild along the coasts of Europe