2021 in Indonesia

Centuries:	19th; 20th; 21st; ; ;
Decades:	2000s; 2010s; 2020s; ; ;
See also:	History of Indonesia; Timeline of Indonesian history; List of years in Indonesia;

2021 (MMXXI) was a common year starting on Friday of the Gregorian calendar, the 2021st year of the Common Era (CE) and Anno Domini (AD) designations, the 21st year of the 3rd millennium and the 21st century, and the 2nd year of the 2020s decade.

The year was marked with the government's COVID-19 vaccination program across Indonesia, which commenced since the vaccination of President Joko Widodo on a live televised event. Due to the outbreak of the more contagious COVID-19 Delta variant, a second wave of COVID-19 cases occurred on June - August, causing hospitals to be filled at near full capacity. The outbreak led the government to impose more restrictions on social activities in public.

During that year, Indonesia was also struck by multiple notable disasters. In January, more than one hundred were killed after an earthquake struck West Sulawesi. In early April, hundreds of people were killed after Cyclone Seroja struck the province of East Nusa Tenggara. On that same month, The Indonesian Navy suffered one of its deadliest accident following the sinking of Nanggala II off the coast of Bali. In December, dozens of people were killed after Mount Semeru erupted.