The travellers who had been at Gunnersbury Park since Sunday left late last night and moved on to Blondin Park.
Speaking to actonw3.com, Tom Jenkins from Ealing, said: "They left tracks across the pitch and are leaving rubbish strewn across the field and driving cars and vans in and out through the south east gate, across the footpath and field with little or no concern for the people walking in the park.
"A school sports day planned for today has been cancelled as a result. Added to this, in little over 24 hours the beautiful bluebell footpath has become a tip for several tons of building waste. This looks like at least 6 truck loads of rubble.''