Proceeds from every Big Mac and Happy Meal purchased tomorrow will also be donated to the charity.
McDonald's franchisee Rob Parry said he encouraged all Rotorua residents to come along to their local McDonald's on McHappy Day and show their support for Ronald McDonald House Charities.
"There will be fun in-store activities, collection buckets and many ways you can donate to this great cause," he said.
McDonald's is also encouraging Kiwis to take a sock selfie of themselves wearing their Ronald socks using the hashtag #forRMHC to help raise awareness.
Ronald McDonald House Charities chairperson Carol Campbell said most of the families the charity supported lived in communities many miles from the hospitals where their children were receiving treatment.
"Without the Houses, these families would be faced with expensive hotel bills or would simply have nowhere to stay."
For more information about McHappy Day visit www.mchappyday.co.nz.