1991 (MCMXCI) wis a common year stairtin on Tysday o the Gregorian calendar, the 1991st year o the Common Era (CE) an Anno Domini (AD) designations, the 991st year o the 2nt millennium, the 91st year o the 20t century, an the 2nt year o the 1990s decade.

Millennium: 2nt millennium
Centuries: 19t century20t century21st century
Decades: 1960s  1970s  1980s  – 1990s –  2000s  2010s  2020s
Years: 1988 1989 199019911992 1993 1994