Diicul or Dicul Buicescul, also known as Diicu Buicescu and Diicu din Epotești (? – ca. July 1659), was a Wallachian statesman, noted as the designated heir of Prince Matei Basarab. A commoner on his father's side, he belonged to the boyardom of Oltenia through his mother's family. His political rise began when Matei, his maternal relative, seized the throne. Diicul alternated civilian offices and command postings in the Wallachian military forces, culminating with his appointment as "Spatharios" in January 1645. His main military involvement came during the wars opposing Wallachia and the Principality of Transylvania to Vasile Lupu's Moldavia. He saw action during the 1650 invasion of Moldavia, resulting in Gheorghe Ștefan's appointment as the puppet Moldavian Prince. In 1653 Buicescul was soundly defeated by Lupu and his Cossack allies, whose invasion of Wallachia was only overturned by Prince Matei's stand at Finta.