Marche Raspail is a wonderful open air food market in the 6th Arrondissement that is open three times a week.  This marketplace is filled with produce vendors, charcuterie stands, eggs, salts, meats, fish, cheeses and spices.  You can also find a nice selection of prepared foods here, as well as vendors selling soaps. 

Market days are Tuesday, Friday and Sunday.  The Sunday market is an organic foods market. 

 Marche Raspail
(On Boulevard Raspail between Rue du Cherche Midi and Rue de Rennes)
75006 Paris

Rue Cler is perhaps my favorite Market Street in Paris.  It has a food market everyday and the street has wonderful cheese shops, charcuteries, butcher shops, olive oil shops, restaurants, bars, gourmet food shops and patisseries.  It is in a wonderful location in the 7th Arrondissement near the Eiffel Tower. 

Rue Cler
(between Rue de Grenelle and Avenue de la Motte Picquet)
75007 Paris