Note that out of these 22 Olympiads 2 of them (Bangla & ICT) don’t have any international segment and some Olympiads are still accepting registration. I have attached those Facebook event links as well as the list of the available websites. You can find the syllabus and everything from there yourself. Hope it helps. Also, I will be entertaining the queries about these in the comments as long as it is within my abilities to answer.
Bangladeshi Olympiads
| Olympiad Name | Categories | Eligibility | Timeline | Website |
|---|---|---|---|---|
| Inter School Bangla Olympiad | 5 | Up to grade 10 | Around December | www.banglaolympiad.org |
| Bangladesh Junior Science Olympiad (BDJSO) | 4 | Grade 3-12 | Around July | www.bdjso.org |
| Bangladesh Astro Olympiad (BdAO) | 2 | Grade 8-12 | Around June | Event Link: https://fb.me/e/2q8brbO0D |
| Bangladesh Biology Olympiad (BdB0) | 4 | Grade 3-12 | Around January | www.bdbo.org |
| Bangladesh Physics Olympiad (BdPhO) | 3 | Grade 6-12 | Around January | www.bdpgo.org |
| Bangladesh Robot Olympiad (BdRO) | 2 | Age 7-18 | Segments: 5 | Around July |
| Bangladesh Math Olympiad (BdMO) | 4 | Grade 3-12 | Around January | www.matholympiad.org.bd |
| IQ Olympiad | 12 | Grade 1-12 | Around July | Event Link: https://fb.me/e/2naEJVwzy |
| Bangladesh Economics Olympiad (BdEO) | None | Grade 8-12 | Around March | |
| Blockchain Olympiad (BdBCO) | 4 | Grade 8-Graduates | Around May | www.bcolbd.org |
| Bangladesh Informatics Olympiad (BdIO) | None | Grade 8-12 | Around December | olympiad.org.bd |
| ICT Olympiad (ICTOBd) | TBA | TBA | TBA | TBA |
| National AI Olympiad | 2 | Grade 3-12 | Around June | |
| Coding Olympiad | 6 | Age 4 to 23 | Around September | Event Link: https://fb.me/e/1NzuC41rH |