Private tours
Your own guide, your own pace, priced per group rather than per person on most listings.
Prices run from NOK564 to NOK8416, and half of the 53 priced listings cost NOK3227 or less. Most take 3 hours to 4 hours. The best reviewed with at least 100 reviews is Oslo: Private Walking Tour with a Local (4.6 from 291 reviews).
For the operators we researched and recommend, see our food tours and cooking classes in Oslo, or the experiences overview.