I don't think you need to necessarily cast it yourself, but it must be cast somehow. So you could probably cast contingency while a cleric casts another spell.
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I was looking for ideas on what spell to contingent and some some people mention cleric only spells. So I was wondering if you personally have to cast the spell that is your contingency.
I read it that you need to cast both spells, because you have one combined casting time that is 10 minutes of the length of the other spell whichever is higher.
The rules say "you" so by RAW you could conclude it is you only in the casting.
While the rules are not explicit, that leaves room to argue one side or another. So the end result is this question isn't one that could be here. It is really more of a Ask your DM question.