Anthony of Isenburg-Grenzau (German: Anton von Isenburg-Grenzau) was the Count of Isenburg-Grenzau from 1552 until 1554. Anthony was the third and youngest son of Count Henry the Elder of Isenburg-Grenzau. As Henry could not afford to educate all three of his sons the eldest two, John and Salentin, were entered into the church and became the Archbishops of Trier and Cologne respectively while Anthony was to succeed his father. Anhtony did so in 1552, but died two years later. He was succeeded by his brother John.