Monte Hermoso Partido is a partido on the Atlantic coast of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 5,000 inhabitants in an area of . Its capital city is Monte Hermoso, from Buenos Aires.
Monte Hermoso is a resort (beach) town on the Southern Atlantic coast. The beaches extend for a length of with a slight decline behind a string of dunes.
Monte Hermoso is situated in the eastern limit of a convergence zone between northern tropical air and southern (polar) cold fronts. It is generally breezy with a strong oceanic influence. The average maximum temperature is and the low is inland in winter.