The 2021 World Series of Darts was a series of televised darts tournaments organised by the Professional Darts Corporation. In 2021, there were set to be five World Series events and one finals event, which for 2021 was moved from Salzburg, Austria to Amsterdam, Netherlands. Due to the COVID-19 pandemic, only one event was held before the 2021 finals, with the remaining four scheduled events postponed to 2022.
Four new venues were due to make their debuts with New York City replacing Las Vegas for the US Darts Masters, and two Australian events were moved to new cities in Wollongong and Townsville. However, only Copenhagen got to play host to its tournament, the 2021 Nordic Darts Masters, which replaced the German Darts Masters.
Though not a tour card holder, Fallon Sherrock was set to appear at all five World Series events as a PDC representative in 2020 after her record-setting top 32 finish at the 2020 World Championship. With all five events being cancelled, she would appear in the 2020 World Series of Darts Finals, and was invited to the Nordic Masters where she became the first woman to compete in a World Series event. After defeating Niels Heinsøe in the first round, and receiving a walkover in the quarter-final courtesy of Gerwyn Price's withdrawal, she defeated Dimitri Van den Bergh in the semi-finals. She ultimately lost the final to Michael van Gerwen as he captured his 16th World Series title.
On 7 April 2021, the US leg and the three Oceanic events were moved to 2022 owing to the continuing COVID-19 pandemic. The 2021 World Series of Darts Finals will go ahead as scheduled on 29–31 October 2021, returning to the AFAS Live in Amsterdam, where the 2019 edition took place.
Prize money
| Stage | Prize money |
|---|---|
| Winner | £20,000 |
| Runner-up | £10,000 |
| Semi-finals | £5,000 |
| Quarter-finals | £2,500 |
| First round | £1,250 |
| Total | £60,000 |
| Stage | Prize money |
|---|---|
| Winner | £70,000 |
| Runner-up | £30,000 |
| Semi-finals | £20,000 |
| Quarter-finals | £15,000 |
| Second round | £7,500 |
| First round | £5,000 |
| Total | £300,000 |
World Series events
| No. | Date | Event | Venue | Champion | Legs | Runner-up | Ref |
|---|---|---|---|---|---|---|---|
| 1 | 4–5 June | US Masters |
 New York City, Hulu Theater
|
Cancelled | |||
| 2 | 6–7 August | New South Wales Masters |
 Wollongong, WIN Entertainment Centre
|
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| 3 | 13–14 August | Queensland Masters |
Townsville, Townsville Entertainment and Convention Centre
|
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| 4 | 20–21 August | New Zealand Masters |
 Hamilton, Claudelands Arena
|
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| 5 | 17–18 September | Nordic Masters |
 Copenhagen, Forum Copenhagen
|
Michael van Gerwen 
|
11–7 |
 Fallon Sherrock
|
|
| 6 | 29–31 October | World Series of Darts Finals |
Amsterdam, AFAS Live
|
Jonny Clayton 
|
11–6 |
 Dimitri Van den Bergh
|
|