Halles Martenot, Market hall from 1870 in Rennes, France.

Halles Martenot is a pair of market pavilions on Place des Lices in Rennes, each 32 m wide and 41 m long, set 25 m apart. The low hipped roof is clad in grey metal panels in horizontal bands; below it a clerestory of small glass panes runs around the upper walls on dark cast-iron columns. The lower walls are filled with brick-red and cream patterned tiles between vertical iron posts, and tall grilled openings line the ground level.

A livestock market is recorded on this spot as early as 1483; a wooden hall built in the early 18th century burned in the Rennes fire of 1720. Jean-Baptiste Martenot drew up a first project in 1861, proposed two equal pavilions in November 1867, and work finished in July 1870. A third pavilion by Emmanuel Le Ray (1907) was joined to the middle hall in 1913. Saved from demolition in the 1970s, the halls were renovated in 1988 and classified as monuments historiques on 13 August 1990.

The two pavilions are named after their architect, Jean-Baptiste Martenot. The south-west hall holds permanent butcher stalls and opens only for the Saturday morning market on Place des Lices; the north-east hall, called halle Martenot, also hosts congresses, fashion shows, exhibitions and receptions, with seating for 1,200.

The two pavilions face each other across a 25 m open alley that leads toward Place de la Trinité. The south-west hall holds permanent butcher stalls and opens only for the Saturday morning market; the north-east hall hosts congresses, fashion shows and exhibitions. A 400-space underground car park lies beneath the paved square.

A third pavilion by Emmanuel Le Ray was added in 1907 and joined to the middle hall in 1913, ahead of banquets planned for 1914 for President Raymond Poincaré's visit. It was demolished during the 1988 renovation, when a pedestrian slab replaced it and a 400-space underground car park was built beneath.