| Lower Saxony | |
| Nickname: | State civil flag (Landesflagge) |
| Use: | 110000 |
| Proportion: | 2:3 |
| Adoption: | 1951 |
| Noborder2: | yes |
| Nickname2: | State Flag (Landesdienstflagge) at sea |
| Use2: | 000010 |
| Proportion2: | 3:5 |
| Adoption2: | 1951 |
The flag of Lower Saxony consists of the flag of the Federal Republic of Germany in Schwarz-Rot-Gold, with the coat of arms of Lower Saxony, shifted slightly toward the hoist. This flag is the civil and state flag. A double tailed version in 3:5 ratio is used as the state ensign.
The flag of Lower Saxony was introduced on 1 May 1951, and made official on 13 October 1952. In the aftermath of World War II a neutral flag was needed for the state of Lower Saxony which consisted of the formerly separate entities of Hanover, Brunswick, Oldenburg, and Schaumburg-Lippe.
Until the official launch of the current flag of Lower Saxony, the former national flags of their respective regions were used at official functions. Developed in parallel, there was a design using the Guelph Hanoverian flag of horizontal yellow and white stripes with the coat of arms in the middle. However, the non-Hanoverian parts of the state rejected this design. Today, the former national flags of Hanover, Brunswick, Oldenburg and Schaumburg-Lippe are seen only at historical or folk events, such as festivals.