Alexei Shirov (Алексе́й Широв) (born July 4, 1972 in Riga, Latvia), is one of the top chess grandmasters in the world today. In the April 2005 FIDE rating list, he was number thirteen in the world with an ELO rating of 2714.

Shirov is noted for his attacking style and for seeking complications, a tendency which has led to comparisons with fellow Latvian and once-world champion, Mikhail Tal.

In 1998, Shirov had a book published called Fire on Board: Shirov's Best Games. He currently lives in, and plays for, Spain.