Mr Castro, 89, told a party congress that he is handing over the leadership to a younger generation "full of passion and anti-imperialist spirit".
His successor will be voted in at the end of the four-day congress.
Although Mr Castro has not endorsed a successor, it is widely believed the party leadership will pass to Miguel Díaz-Canel, who took over as the island's president in 2018.
And why has the country been in so many economic crises?
Why don't you mention what kind of "government" Castro toppled?
Fuck yeah.
Who?
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Cubans in Miami duh.