| Season: | 2009–10 |
| Competition: | Qatar Stars League |
| Winners: | Al-Gharafa |
| Relegated: | Al-Shamal |
| Continentalcup1: | AFC Champions League |
| Continentalcup2: | AFC Cup |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The 2009-10 Qatari League or Qatari Stars League season was the 37th edition of top-level football championship in Qatar, which started in September 2009 and ended in April 2010.
The Qatar Stars League slowly expanded since the turn of the decade, moving from 9 to 10 clubs and then latest setup of 12 clubs for the Qatari League 2009-10 campaign.
There are 2 divisions in the Qatari football structure and the league has previously seen one club promoted and relegated each year except in 'expansion' years.
It was announced on 15 April 2009 that no clubs would be relegated from the top flight in the Qatari League 2008-09 season, due to expansion reasons. The announcement was made with only one game remaining.[1]
The expansion benefited relegated Al Kharatiyat, who will now stay in the first division, and will be joined by two second division clubs Al Ahli and Al Shamal, to bring the number up to 12.
Sheikh Hamad Bin Khalifah said the expansion would help in improving league action, which was also curtailed to two rounds instead of the prevailing system where the teams played each other three times.
| Team | Outgoing manager | Reason of departure | Replaced by | Date Replaced | |
|---|---|---|---|---|---|
| Al-Gharrafa |  Marcos Paqueta | Contract not renewed [3] | Caio Junior | July 2009 | |
| Al Ahli |  Carlos Manuel | Contract not renewed [4] | Richardo | July 2009 | |
| Al-Rayyan | Paulo Autuori | Contract not renewed [5] | Marcos Paquetá | July 2009 | |
| Al Ahli | Richardo | Contract not renewed [6] | Cesa | November 2009 | |
| Al-Rayyan | Marcos Paquetá | Sacked [7] | Paulo Autuori | November 2009 | |
| Al-Shamal | Robertinho | Sacked [8] |  Alain Michel | November 2009 | |
| Umm-Salal Sports Club | Gerard Gili | Sacked [9] | Henk Ten Cate | March 2010 |
