Aleksandr Aleksandrovich Ryazantsev (Russian: Александр Александрович Рязанцев, born 5 September 1986) is a Russian footballer who plays as a winger or attacking midfielder for FC Torpedo Moscow. He scored the first goal for Rubin Kazan on 20 October 2009, a thunderous 30-yard strike in their shock 2–1 away victory at the Camp Nou against Barcelona in a Champions League group stage match. The goal against Barcelona was described as a "heavenly thunderbolt" by many of his teammates and was remembered as one of the goals of the tournament.
From January 2003 to December 2005, Ryazantsev played for FC Moscow, formerly known as FC Torpedo-Metallurg Moscow, of the Russian Premier League. He made his professional debut on 19 April 2004 in a 2–1 home wins against Krasnodar. He appeared in 2 matches for the team.
Ryazantsev signed for Rubin Kazan before the start of the 2006 Premier League season. His first appearance was as a substitute in a match against Spartak Moscow. He appeared in the starting lineup in the home match against Krasnodar and managed to score a goal. He was also a starter when the team won the 2007 Russian Premier League. In 2008 Russian Premier League Ryazantsev brought his team into champions Rubin Kazan in the Russian Premier League in 2008, he appeared 22 times and scored 1 goal and 3 assists.