Dendritic diamond crystals have been formed by using a simple method of hot-filament-assisted chemical vapor deposition. A dendritic single crystal consists of three square prisms elongated to the direction of [100], [010] and [001], and one to four triangular pyramids elongated to [111]. Twins and aggregates attached to dendritic individuals are also found. Dendritic diamonds are formed under the conditions of higher filament temperature and substrate temperature than those for polyhedral diamond growth.