Pecetto di Valenza (Piedmontese: Apsèj) is a commune of the Province of Alessandria in the Piedmont region of northwest Italy with a population of 1282 (December 2008 estimate).

It is south of the river Po, and about 8 kilometres (5 mi) northeast of the provincial capital of Alessandria, on an eastern spur of the hills of the Basso Monferrato.

The commune's neighbours are Alessandria, Bassignana, Montecastello, Pietra Marazzi, and Valenza.

[1][3] The municipal boundaries enclose an area of 11.5 square kilometres (4.4 sq mi) that ranges in elevation from 85 to 261 metres (279 to 856 ft) above sea level and is predominantly agricultural in character: the economy is largely based on the cultivation of cereals and grapes.

Four distinct settlements are identified in the Statuto comunale as "historically recognised by the community"; these were also the four designated places for the 2001 census.