Fyodor (Theodore) I Ivanovich (Russian: Фёдор I Иванович) or Feodor I Ioannovich (Russian: Феодор I Иоаннович); 31 May 1557 – 16/17 January (NS) 1598), also known as Feodor the Bellringer, was the last Rurikid Tsar of Russia (1584–1598).

Feodor's mother died when he was three, and he grew up in the shadow of his father, Ivan the Terrible. A pious man of retiring disposition, Feodor took little interest in politics, and the country was effectively administered in his name by Boris Godunov, the brother of his beloved wife Irina. His childless death left the Rurikid dynasty extinct, and spurred Russia's descent into the catastrophic Time of Troubles.

In Russian documents, Feodor is sometimes called blessed (Russian: Блаженный). He is also listed in the "Great Synaxaristes" of the Orthodox Church, with his feast day on January 7 (OS).

Feodor was born in Moscow, the son of Ivan IV (The Terrible) by his first wife Anastasia Romanovna. Although he was the sixth and youngest child of his mother, he grew up with only one older brother, Ivan, because all his other older siblings died before Feodor was one year old. His mother also died by the time Feodor was three years old, and her death greatly affected his father, who had been very attached to his wife. Ivan the Terrible began to earn his sobriquet 'the terrible' during the years of Feodor's childhood. He also took a series of other wives, but Feodor's only surviving half-sibling, Dmitry of Uglich, was fully twenty-five years younger than him.

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