He has been sentenced to five years in prison.
The trial comes amid growing resentment among South Korea's public against big companies termed 'chaebols'.
Who is Lee Jae-Yong?
Widely referred to as the "Crown Prince of Samsung", Lee Jae-Yong served as the Vice-Chairman of the Samsung group at the time of sentencing. The Forbes magazine placed him 40th in the 2016 list of most powerful people in the world.
What are the charges against Lee?
Lee has been implicated for embezzlement, bribery and covering up assets overseas.
He has been accused of making a $41 billion dollar donation to two non-profit organizations run by Choi Soon-sil, a friend of the former President seeking political favours.
Prosecutors further allege that Lee made the donations to gain government support for restructuring Samsung electronics in a way that strengthened his control.
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How is this affecting Samsung?
The Samsung group comprising 60 companies contributes about a fifth of South Korea's GDP.
Considered the de-facto head of Samsung, the case has definitely damaged Lee's reputation as one of South Korea's top businessmen.
Although experts had speculated that Lee's arrest would destabilize Samsung's operations, they have largely continued unaffected since his arrest in February.
Park Geun hye