|Flag of Kaluga Oblast|
|Adopted||January 30, 2004|
The flag of Kaluga Oblast, Russia, is a horizontal tricolour of red, white, and blue, with width of the stripes 5:2:5, charged with a golden imperial crown in the middle of the red stripe.
- The red stands for strength and fearlessness in protection of the motherland, bravery, and the blood the citizens of Kaluga shed in many wars, especially in the Great Patriotic War (1941-1945).
- The green is taken from the oblast coat of arms and stands for hope, youth, nature, fertility, and eternal life.
- The white stands for clear and pure thoughts of the citizens, for the Oka River, and for Mother God's belt, saint patron of Russia. 
The flag is similar but unrelated to the flag of another Russian region, the Republic of Tatarstan.