This is a list article about flags that have been used by pro-Russian separatists in Ukraine and in areas occupied by Russia and Russian-controlled forces during the Russo-Ukrainian War.

The flag [ru] of the Donetsk People's Republic was claimed by the Russian-controlled militias to be based on the flag of the Donetsk–Krivoy Rog Soviet Republic, whom they claim as the "People's Republic's" predecessor. However, there is no evidence of any such flag in 1918, and it is most likely based on the flag of the International Movement of Donbass, a Soviet anti-Ukrainian independence organisation started at Donetsk University in August 1989.

The original DPR flag also featured a coat of arms of the republic that said "Donetsk Rus'" (Донецкая Русь) in the centre. It was identical to the eastern Ukrainian Donetsk Republic political party flag, while also retaining the words "Donetsk Republic" (Russian: Донецкая Республика). A simpler white double-headed eagle variant was used by pro-Russian protesters since 7 April 2014 and then by separatists of the Donbas People's Militia.

By October 2014, a second main flag which carried the words "Donetsk People's Republic" (Донецкая Народная Республика) was created with an updated doubled-headed eagle that looked less similar to the Russian coat of arms. This flag appeared to be more prominently used by the militant organization, even appearing on ballot boxes during their 2014 elections.^{[citation needed]} The simplified black, blue and red tricolor without inscriptions or coats of arms started being adopted after 2017.^{[citation needed]}

There have been several flags [ru] used to represent the Luhansk People's Republic. The first flag featured a similar design to the flag used by the Donetsk People's Republic, the main differences being that the top stripe was light blue or azure, a color used in the 1950–1992 flag of the Ukrainian SSR, instead of black. It featured a different coat of arms, and it contained the words Luhansk Republic (Луганская Республика) in Russian. The original shade of light blue used for the top stripe may have been inspired by the shade of blue used in the flag of the city of Luhansk. The second was adopted at some point in October 2014, with an abbreviation of the group's local name replacing the aforementioned text. On 2 November 2014, the Republic adopted a new flag that resembled the previous flags but lacked the coat of arms.

Russia initially occupied much of Kherson Oblast in early 2022, but was forced to retreat from the right bank of the Dnieper River, giving up the city of Kherson in November.

At the Moscow signing ceremony between Russian President Vladimir Putin and the Russian-installed head of the occupied part of the oblast, Volodymyr Saldo, the flag of Kherson Oblast was presented as a blue field with a white stripe in the middle, featuring the 1803 coat of arms of Kherson supported by golden oak branches and blue ribbons, and surmounted by the Imperial Crown.^{[failed verification]}

Russia occupies the southern half of Ukraine's Zaporizhzhia Oblast as of 2023.