thumb|300px|A memorial sign denoting a 101 km distance
The 101st kilometre () is a colloquial phrase for restrictions on freedom of movement in the Soviet Union.
Practice
The 101st kilometre became a colloquial phrase for limits on freedom of movement under propiska, the Soviet system of controlling internal migration. During most of the Soviet era, criminals and other "undesirables" including the ones released from the Gulags were often restricted from settling in larger urban centers such as Moscow.