Volunteering is a great way to get to know people and get involved in your local community. It can also be a good opportunity to practice your Danish!.
The main portal for volunteer jobs in Denmark is frivilligjob.dk. Here you can search for volunteer opportunities based on key words, location, type of work, and organisation.
Socialvejviser.dk allows you to choose volunteering opportunities based on categories such as 'Children and Youngsters' or 'Humanitarian Organisations'.
If you are looking specifically for volunteer opportunities in English, then you can visit Frivilligjob.dk’s subsite, volunteering.dk. This site focuses on matching organisations with volunteers with an international background.