Yes, Intel Celeron N4000 processor is compatible with Windows 11. That is to say, Intel Celeron N4000 processor based device can upgrade from Windows 10 to Windows 11. You can also check the processor list compatible with Windows 11, which is released by Microsoft.

Why does Intel Celeron N4000 support Windows 11?
According to Microsoft, only 8th generation intel processors or higher generation can support Windows 11. The Intel Celeron N4000 has 2 cores with 2 threads and is based on the 9. gen of the Intel Celeron series. That’s why Intel Celeron N4000 is compatible with Windows 11. In addition to Intel Celeron N4000, there are other Intel Celeron processors compatible with Windows 11.
- Intel Celeron N4000
- Intel Celeron N4020
- Intel Celeron N4100
- Intel Celeron N4120
- Intel Celeron N4500
- Intel Celeron N4505
- Intel Celeron N5100
- Intel Celeron N5105
- Intel Celeron N6210
- Intel Celeron N6211
Although Intel Celeron N4000 is compatible with Windows 11, your device should meet other requirements for Windows 11. Otherwise, you still cannot run Windows 11.
Can I Install Windows 11 on Unsupported PC?
If your device does not meet the requirements for Windows 11, then you can’t upgrade your Windows to Windows 11 via Windows program. It doesn’t mean you can try the Windows 11 on the unsupported PC. You can perform a clean install of Windows 11. The detailed steps are in the article: How to Install Windows 11 on Unsupported PC?
Note: To improve the Windows 11 experience, Microsoft has strict requirements for Windows 11, which includes processor, TPM2.0, UEFI support and Memory.
1 Processor: Windows 11 requires 1 GHz or faster with two or more cores on a compatible 64-bit processor.
2 Memory: Windows 11 requires 4GB of RAM to run.
3 TPM 2.0: A TPM 2.0 chip is the minimum system requirement for Windows 11.
4 UEFI: UEFI is a tangible electronic component with embedded software instructions BIOS. Windows 11 needs UEFI system firmware with Secure Boot.
Summary
Intel Celeron N4000 does support Windows 11. It is based on the 9th generation of the Intel Celeron series. Only processors higher than 8th generation of the Intel processors can run Windows 11.