Synonyms of on behalf of/on someone's behalf in English:

on behalf of/on someone's behalf

See definition of behalf


1‘I am writing to you on behalf of my client’

as a representative of, as a spokesperson for, for, in the name of, with power of attorney for, in place of, on the authority of, at the behest of
appearing for, representing
in the interests of

2‘she campaigned on behalf of chimpanzees in the wild’

in the interests of, in support of, for, for the benefit of, for the good of, for the sake of, to the advantage of, to the profit of, on account of