Alyaksandr Nyachayew (; ; born 21 April 1994) is a Belarusian professional footballer who plays for Tajikistan Higher League club Khujand.
On 19 January 2022, Nyachayew signed a 1.5-year contract with Azerbaijani club Sabah. On 29 December 2022, Nyachayew left Sabah after his contract was terminated by mutual agreement.
On 13 February 2023, Nyachayew signed a one-year contract with Minsk.