I will let Him dictates me. Is this a correct sentence? \"Him\" can be considered a noun?

'him' is a pronoun, used instead of a noun.

I let Paul dictate to me.
I let him dictate to me.

It is wrong.

I will let him dictates me.

You must remember. There is an infinitive "to" before "dictate.

I will let him (to) dictate me.

You may use "him" or a noun but you can not use "dictates". You have to use "dictate" because there is a hidden "to".

I hope it helped you.

Biplab
India