Feria de San Telmo, Outdoor flea market in San Telmo district, Buenos Aires, Argentina.

Feria de San Telmo is a Sunday flea market in the San Telmo neighborhood of Buenos Aires, Argentina, running along Defensa Street and gathering around Plaza Dorrego at its center. The stalls cover several city blocks and offer antiques, handmade crafts, and local goods, with the most established antique dealers concentrated near the plaza.

The market began in 1970 as a small gathering of antique dealers around Plaza Dorrego. Over the following decades, it grew steadily and expanded along Defensa Street and into the surrounding streets.

On Sundays, tango shows and orchestras perform on the streets around Plaza Dorrego for all visitors, and food is sold by restaurants and informal sellers. The fair's main draw, though, is its antiques and cultural items, offered at 270 stands.

The market runs on Sundays and covers several blocks, so comfortable shoes and a relaxed pace make the visit easier. Plaza Dorrego is a good starting point, as most stalls spread in both directions along Defensa Street from there.

Some of the objects sold at the stalls come directly from private households that kept items across several generations, including old gramophones, Bakelite telephones, and tin toys from the mid-20th century. These pieces often reach the market without ever passing through an antique shop, making their origins traceable to specific families.