Award-winning Zimbabwean writer Chenjerai Hove has called on Grace Mugabe, the wife of Zimbabwe's leader Robert Mugabe, to hand back her PhD.
She was awarded a doctorate from the University of Zimbabwe last month.
But there has been confusion over when she enrolled, with some sources saying it was only two months ago - and students want the issue investigated.
The university authorities have not yet commented on the controversy.
"It [the award] removes the integrity of our academic standing the world over," Mr Hove told BBC Focus on Africa.
A graduate and faculty member of the University of Zimbabwe, the novelist and poet, who is living in Norway, said he had written to the vice-chancellor to demand an explanation.
"I have lost the pride and prestige of being a former student of the university which you head since our academic degrees have now become a laughing stock," he says in the letter.
His remarks come as the Zimbabwe National Students Union prepares to file a court application on Thursday demanding that the University of Zimbabwe provide details about how the first lady came to be awarded the degree.
Amongst the concerns expressed by students is the fact that the first lady's thesis is not available in the university's library, as would be usual.