Arjen Anthony Lucassen (born 3 April 1960, Hilversum) is a Dutch progressive metal/rock songwriter, singer, multi-instrumentalist musician and record producer, best known for his long-running progressive opera project titled Ayreon.

Lucassen started his career in 1980 as the guitarist and backing vocalist of Dutch band Bodine as Iron Anthony, before joining Vengeance in 1984. After eight years he left the band, wanting to go into a more progressive direction, and released two years later an unsuccessful solo album entitled Pools of Sorrow, Waves of Joy under the nickname Anthony.