德比郡（英语：Derbyshire，读音： /'dɑːbɪʃə/），英国英格兰东米德兰兹的郡，行政总部位于马特洛克（Matlock）。以人口计算，德比是最大城市，切斯特菲尔德是第一大镇（Town）。

德比郡是34个非都市郡之一，实际管辖8个非都市区，占地2,547平方公里（第20），有754,100人口（第11）；如看待成48个名誉郡之一，它名义上包含多1个单一管理区─德比，占地增至2,652平方公里（第21），人口增至990,400（第20）。

峰区国家公园（Peak District National Park）的大部分范围位于德比郡北部。

Derbyshire (/ˈdɑːrbᵻʃər/ or /ˈdɑːrbɪʃɪər/; abbreviated Derbys. or Derbs.) is a county in the East Midlands of England. A substantial portion of the Peak District National Park lies within Derbyshire. The southern extremity of the Pennine range of hills extends into the north of the county. The county contains part of the National Forest, and borders on Greater Manchester to the northwest, West Yorkshire to the north, South Yorkshire to the northeast, Nottinghamshire to the east, Leicestershire to the southeast, Staffordshire to the west and southwest and Cheshire also to the west. Kinder Scout, at 636 metres (2,087 ft), is the highest point in the county, whilst Trent Meadows, where the River Trent leaves Derbyshire, is its lowest point at 27 metres (89 ft). The River Derwent is the county's longest river at 66 miles (106 km), and runs roughly north to south through the county. In 2003 the Ordnance Survey placed Church Flatts Farm at Coton in the Elms (near Swadlincote) as the furthest point from the sea in Great Britain.