The first place to go with the whole family is Tusenfryd, the famous amusement park in Oslo (located about 15km from the city). At Tusenfryd, as the park's name translates, you can enjoy swimming in the pool, adults can experience super-extreme rides, and toddlers can have fun riding the cute steam train.
And if you're traveling in winter, one of the best activities for kids in Oslo is to go skiing. Tryvann Vinterpark Ski has a playroom and ski school for the youngest ones (starting from age 3).
When going on vacation with kids in Oslo, start by finding out about any discounts for younger travelers. Discounts are available at hotels, museums, and attractions.
When choosing activities for kids in Oslo, consider visiting the Oslo Reptile Park, the local Filmmuseet, the Viking Ship Museum, and the International Museum of Children's Art.
Looking for something more active? Then check out the Child Planet entertainment center, where energetic kids can have a blast on a unique playground (children only need to pay 60 NOK on weekdays).
Children can also have a great time at the indoor children's park Gigagøy (entrance fee for children from 1 year old - 120 NOK) and Summerpark, where you can rent a bike (starting from 360 NOK) or try rock climbing (starting from 170 NOK).