Duer is a surname. Notable people with the name include:
Alice Duer Miller (1874–1942), American poet Alva Duer (1904–1987), American college basketball coach Carolina Duer (born 1978), Argentine world champion boxer Caroline King Duer (1865–1956), American editor and writer John Duer (1782–1858), American attorney and jurist John Duer Irving (1874–1918), American geologist Katherine Duer Mackay (1878–1930), American suffragist and socialite Melinda Duer, British chemist Roland Duer Irving (1847–1888), American geologist Thomas Duer Broughton (1778–1835), English soldier and writer William Duer (Continental Congressman) (1743–1799), British–American lawyer, developer, and land speculator William Duer (U.S. Congressman) (1805–1879), American lawyer and statesman William Alexander Duer (1780–1858), American lawyer and judge