The Levey–Jennings chart is a type of statistical process control (SPC) chart, typically used in laboratory quality control applications.

It differs from the traditional Shewhart individuals control chart because it uses the long-term (overall or population) estimate of sigma instead of the short-term (i.e., within subgroup or sample) estimate of sigma.

A Levey–Jennings chart is a graph that quality control data is plotted on to give a visual indication whether a laboratory test is working well. The distance from the mean is measured in standard deviations. It is named after Stanley Levey and E. R. Jennings, pathologists who suggested in 1950 that Shewhart’s individuals control chart could be used in the clinical laboratory. The date and time, or more often the number of the control run, is plotted on the x-axis. A mark is made indicating how far the actual result was from the mean, which is the expected value for the control. Lines run across the graph at the mean, as well as one, two and three standard deviations to either side of the mean. This makes it easy to see how far off the result was.