Jill is one of the girls who is/are missing.

[kohyoongliat]

Jill is one of the girls who is/are missing.

Which is the correct verb?

Thanks.

[Rover_KE]

A case can be made for both options.

***

I have changed your thread title.

'Thread titles should include all or part of the word/phrase being discussed.'

[emsr2d2]

Use "is" if you take "who" to refer to Jill. Use "are" if you take "who" to refer to the missing girls.

[jutfrank]

My instant interpretation was that there are multiple missing girls, so are.

I think it's very unlikely to be meant in the other way. In fact, I think it barely makes any sense at all. Do other members not agree?

kohyoongliat, please tell us where you got this sentence.

[GoesStation]

I agree.

[kohyoongliat]

I got it from one of my grammar books. I cannot remember which one.

The answer provided is "are".

[Tdol]

There are grammar books and grammar books.

[Phaedrus]

I got it from one of my grammar books. I cannot remember which one.

The answer provided is "are".

Welcome back, kohyoongliat. If you look through your thread here, you will find a variety of perspectives. Your thread was closed and reopened -- twice.

Because you hadn't replied to, "liked," or clicked "thank" on any of the postings, it was assumed that you had no interest in the thread you had started.

[Yankee]

I have to go with "is". Remove "of the girls".

[Raymott]

A simple reordering gives "Of the girls who are missing, one is Jill". "are" sounds most natural and grammatical to me.
In both cases, you already have an "is" for Jill.