A: Both expressions are correct, but they mean slightly different things. I discuss this in my book Woe Is I. “In behalf of” means “for the benefit of” or “in the interest of.” “On behalf of” means “in place of” or “as the agent of.”

Is it on behalf or on the behalf?

In behalf, they argue, is used when the meaning is in the interest of someone else, but on behalf is used when speaking for someone. For example, a medical decision would be made in behalf of the patient, and you would speak on behalf of your family. The reality is that on behalf is typically used for both meanings.

Is it correct to say on my behalf?

There are two correct ways to form this phrase: on my behalf. on behalf of me.