NGC 3408 is a spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . It was discovered by German-British astronomer William Herschel on 8 April 1793.
NGC 3408 is a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.
Supernova One supernova has been observed in NGC 3408: SN 2018ka (TypeIa, mag. 19.4) was discovered by R. Gagliano, R. Post, E. Weinberg, Jack B. Newton, and Tim Puckett on 17 January 2018.
See also List of NGC objects (3001–4000)
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