The JLC 891 is a watch full calendar automatic movement from Jaeger-LeCoultre.

Calibre 891 was introduced in 1992 and was replaced in 2005 by Calibre 924, which adds a power reserve indicator and moon phase.

Calibre 891 is an automatic movement running at 28,800 vph. It has 36 jewels and a power reserve of 40 hours. It is a traditional-looking movement with central sweep hands for hour, minute, and date pointer, and a subdial for seconds. It also has windows for day and month at 10 00 and 2 00, respectively.

Jaeger-LeCoultre used this calibre in the Jaeger-LeCoultre Master Calendar.