Credit line or attribution line holds information that author of the work requests all users to include with the work, as a condition of use enforced by the license. Specifically widely used Creative Commons CC-BY licenses and GFDL licenses require all users of the work to attribute the author.

Although the term "credit line" is used here, the required attribution need not be specified as a credit line, neither is the format of the attribution specified.

This article gives examples and guidance on such a credit line.