List of longest prison sentences served

This is a list of longest prison sentences served by a single person, worldwide, without a period of freedom followed by a second conviction. These cases rarely coincide with the longest prison sentences given, because some countries have laws that do not allow sentences without parole or for convicts to remain in prison beyond a given number of years (regardless of their original conviction).

Longest spells in solitary confinement
The sentence duration refers to the time spent in solitary confinement, regardless of time spent in normal prison before or after. Death row prisoners, who are usually also held in isolation, are not included.

Longest spells on death row
These prisoners were sentenced to death rather than prison, but their execution was stalled for a prolonged time due to different reasons.

Other sources

 * . Lists the lengthiest sentences actually completed, with detailed case studies.