Marina Sergeyevna Maksimova (Russian: Марина Сергеевна Максимова; born 10 June 1983), better known under her stage name MakSim (Russian: МакSим; earlier – Maxi-M) is a Russian singer, songwriter, and music producer.

MakSim rose to fame in the Russian-speaking world in the mid-2000s after releasing her debut album Trudnyi vozrast in 2006. She went on to release a string of successful singles afterwards, including "Moy ray", "Znayesh li ty" and "Vetrom stat'", which all topped the TopHit radio charts. Between 2007 and 2010, she enjoyed the peak of her career. In 2007 and 2008, MakSim won the award for Best Female Russian Singer at the MTV Russia Music Awards and in 2008 and 2009 won the same prize at the Muz-TV Music Awards, also winning the prize for Best Album in 2008 for Moy ray.

Maksimova was born in Kazan in 1983 in a family of automechanic Sergey Abrosimov and kindergarten teacher Svetlana Maksimova. In her childhood, she was said to have been inseparable from her older brother Maksim, therefore taking his name as her nickname. From a young age, she was involved in music and studied vocals and piano at a local music school. In her childhood, Maksimova also enjoyed karate, reaching up to a red belt. Afterwards, Maksimova studied at the Kazan National Research Technical University named after A.N. Tupolev, where she graduated with a degree from the Faculty of Humanities.

At the age of 15, Maksimova decided that she wanted to dedicate her life to music. She had participated in several music competitions in her schools prior, but then decided to become the lead singer of the Kazan group Pro-Z. With Pro-Z, she performed at several local events, enjoying local popularity. However, nationwide fame stayed out.

In 2003, Maksimova recorded her first independent song "Trudnyi vozrast" with the members of Pro-Z, which did not receive much radio attention. However, her follow-up single "Santimetry dykhaniya" peaked at number 34 on the TopHit general radio charts, which combined all radio charts in Eastern Europe.

After this, Maksimova moved to Moscow to create a larger chance for her music to be heard. However, upon arriving in Moscow, she did not have a place to live. For eight days, she slept in a train station before she met her future roommate, with whom she rented a one-room apartment for the course of six years.

In 2005, Maksimova signed a deal with Gala Records and re-released her song "Trudnyi vozrast", then breaking through in the Russian music industry, subsequently releasing an eponymous album a year later. In that time, MakSim also shot her first music videos for the songs "Trudnyi vozrast" and "Nezhnost'". Following the release of her album, MakSim embarked on her first nationwide tour.

With the single "Otpuskayu" in late 2006, MakSim was catapulted in nationwide fame, scoring her first number-one single in Russia. Her follow-up record "Znayesh' li ty" also topped the TopHit charts. As a result of her sudden commercial acclaim, her label motivated her to record a second album. MakSim's sophomore album Moy ray was subsequently released in November 2007.