Iraqi-born Zaha is joined by Hamilton Associates and Hawkins\Brown in the final five in the race to masterplan the park and draw up proposals for the children's 'discovery centre'.
This trio will face competition from the Syrian practice Wael Samhouri and Danish firm Henning Larsen.
The project will be for Massar, a not-for-profit development programme dedicated to 'unlocking the potential of Syrian children'.
The brief demands that the discovery centre will be 'emblematic' of the entire scheme, which includes an outreach programme that has engaged with around 35,000 young people already, a website, regional discovery centres, and print and television campaigns.
The selection process is still ongoing and is 'based on each practice's approach to the site'.