Oleksiy Miacheslavovych Danilov (Ukrainian: Олексій Мячеславович Данілов; born 7 September 1962) is a Ukrainian politician who was the secretary of the National Security and Defense Council of Ukraine from 2019 to 2024, when he was replaced by Oleksandr Lytvynenko, the former head of the Foreign Intelligence Service.

Danilov graduated in 1981 from the Starobilsk State Farm Technical School with a degree in veterinary medicine. In 1981 he began working as a veterinary in a farm in Voroshilovgrad (currently Luhansk). From 1983 to 1987, he worked as a veterinarian in Voroshilovgrad's park "1 May". From 1987 to 1991 he worked as a private veterinarian. From 1991 to 1994 he was engaged in private entrepreneurship.

Danilov was Mayor of Luhansk from 1994 to 1997. Aged 31 years, he was the youngest ever mayor of Luhansk.

In the 1998 Ukrainian parliamentary election Danilov unsuccessfully ran for a parliamentary seat in electoral district 103 as an independent candidate.

In 1999, Danilov graduated from the University of Luhansk as a licensed history teacher. In 2000, he received a master's degree in management from the East Ukrainian Volodymyr Dahl National University. In 2000, he also received a law degree from the Luhansk State University of Internal Affairs.

In the early 2000s, Danilov was a member of the Yabluko party (which was renamed Party of Free Democrats during his membership). In the 2002 Ukrainian parliamentary election he ran unsuccessfully for parliament on the party list.

In 2000, Danilov was an adviser to the parliamentary Committee on Industrial Policy and Entrepreneurship. From October 2001 to February 2005, he founded the Luhansk Initiative and was its chairman. At the same time, he was as deputy director of the Institute for European Integration and Development (IEID).

Danilov served as the Governor of Luhansk Oblast in 2005.