Sankt-Peterburg (Russian: Санкт-Петербург; literally: Saint Petersburg) is a Russian diesel-electric icebreaker. She was built at Baltic Shipyard in 2009 as the second vessel for Project 21900, the first series of non-nuclear icebreakers built in Russia after the dissolution of the Soviet Union. She has an identical sister ship, the 2008-built Moskva. Following the construction of Sankt-Peterburg, three icebreakers of slightly upgraded design (Vladivostok, Murmansk and Novorossiysk) were built in 2015–2016.