Whether a word should be capitalized in title case depends on its word class. So, which word class does our belong to? Most dictionaries say it is a (possessive) determiner, although a few classify our as adjective. But that difference is actually not important, because all title case styles agree that only prepositions, articles and conjunctions are lowercased. Since our is none of these, it must therefore always be capitalized in titles, as shown in the following examples:
The Fault in Our Stars
Flags of Our Fathers
We Sold Our Soul for Rock ’n’ Roll
If you are unsure about capitalizing titles, check out the Title Case Converter which will not only capitalize your titles correctly, but also tell you for each word why it was capitalized or not.
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