In a medium pot, stir together cranberries, maple syrup, and orange juice. Cover and bring the mixture to a boil, then remove the cover and lower the heat. Simmer for about 5 minutes, or until berries are soft and some are breaking apart. Stir occasionally while it simmers.
Remove from the heat and mash the berries. Slowly whisk in the chia seeds. Let the mixture cool for a few minutes, then cover and refrigerate for at least an hour to thicken. This cranberry sauce keeps for over a week in the refrigerator.