| Competition: | Eerste Klasse |
| Season: | 2020–21 |
| Winners: | None |
| Promoted: | No promotion |
| Relegated: | No relegation |
| Promotion To: | 2021–22 Hoofdklasse |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
2020–21 Eerste Klasse was an Eerste Klasse season. The teams were near-identical to the 2019–20 Eerste Klasse season, after the COVID-19 pandemic in the Netherlands caused the KNVB to decide that there would be no relegation and promotion following the previous season. A few teams promoted anyway to the Hoofdklasse and Eerste Klasse.
The league commenced on 22 August 2020 for the Saturday sections and 23 August for the Sunday sections[1] and were curtailed on 24 February 2021, when the KNVB discontinued category A senior competitions in this season, including Eerste Klasse, again without promotion or relegation.[2]
Participating clubs were:[3]
Participating clubs were:[3]