(Major) Mykola Melnychenko (Ukrainian: Микола Іванович Мельниченко, born 18 October 1966 in Vasylkiv, Ukrainian SSR) was a bodyguard of Leonid Kuchma (President of Ukraine), an officer of the State Security Administration.
Between 1998 and 2000 Melnychenko allegedly recorded numerous conversations that took place in Kuchma's office before fleeing abroad with the secretly taped recordings. The publication of these recordings in 2000 caused a major scandal in Ukraine (known as the Cassette Scandal), which dramatically affected the country's domestic and foreign policy. Melnychenko's principal accusations against Kuchma (supposedly confirmed by the recordings) are the ordering of the kidnapping and murder of journalist Georgiy Gongadze. The United States government became involved after one of the records revealed the alleged transfer of an advanced Ukrainian radar system Kolchuha to Saddam Hussein's Iraq. Hundreds of other allegations are based on the recordings.
Mykola Melnychenko was born in the village of Zapadynka, Kiev Oblast (now outskirt of Vasylkiv) to a family of coal miners moved from the Donbas. He graduated from the Kiev Military Institute of Control and Signals in Kiev and became a KGB communications protection expert. In 1992, soon after the collapse of Soviet Union, Melnychenko started his career in Ukraine's State Security Administration (formerly the 9th Directorate of the Committee for State Security (KGB)). Later, he joined President Leonid Kuchma's team of bodyguards and at the time of the scandal, Melnychenko held the rank of Major. His main duty was to protect the President's office against possible eavesdropping.