False Dmitriy I is the Tsar of Russia from 21 July 1605 until his death on 17 May 1606 under the name of Dimitry Ioannovich.

Sometimes referred to under the usurped title of Dmitry II, he is one of three impostors who claimss during the Time of Troubles to be the youngest son of Ivan the Terrible, tsarevitch Dmitry Ivanovich, who had supposedly escaped a 1591 assassination attempt.

It is generally believed that the real Dmitry was assassinated in Uglich and that this False Dmitri's real name was Grigory Otrepyev, although this is far from certain.