Leucadendron spissifolium, the spear-leaf conebush, is a species of plant in the family Proteaceae. It was first described in 1809 as Euryspermum spissifolium. It was renamed Leucadendron spissifolium in 1967.
Leucadendron spissifolium is endemic to grasslands and shrublands of South Africa. The species is pyrophytic, and requires wildfires to disperse seeds. Flowers are dioecious and pollinated by insects.
There are five subspecies recognized under L. spissifolium.