This is a list of the individuals who were, at any given time, considered the next in line to inherit the throne of Russia or Grand Prince of Moscow.
All heirs in this period were nominated by the reigning monarch, rather than holding the position by right of inheritance.
Despite Peter the Great's modification of the law to allow nomination of a successor by the monarch, neither he nor his two immediate successors ever nominated an heir, and Catherine I, Peter II, and Anna were all chosen irregularly, after the death of their predecessor.
In addition, Ivan VI, who had not named a successor, was deposed in a coup, while Peter III, who was deposed and murdered after a coup, was succeeded not by his son Paul, his chosen successor, but by his wife, who became Catherine II.
At the death of Alexander I, the next brother, who would become Nicholas I, deferred his claims until his older brother Constantine renounced once again, but after Constantine's second renunciation he claimed to have taken the throne immediately upon Alexander's death.