The 2016 Democratic National Convention was a presidential nominating convention, held at the Wells Fargo Center in Philadelphia, Pennsylvania, from July 25 to 28, 2016. The convention gathered delegates of the Democratic Party, the majority of them elected through a preceding series of primaries and caucuses, to nominate a candidate for president and vice president in the 2016 United States presidential election. Former U.S. Secretary of State Hillary Clinton was chosen as the party's nominee for president by a 54% majority of delegates present at the convention roll call securing it over primary rival Senator Bernie Sanders, who received 46% of votes from delegates, and becoming the first female candidate to be formally nominated for president by a major political party in the United States. Her running mate, Senator Tim Kaine from Virginia, was confirmed by delegates as the party's nominee for vice president by acclamation.

Delegates at the convention also adopted a party platform, through a voice vote, to take to the 2016 elections, touted as the "most progressive" platform in the Democratic Party's history. The progressive shift was often credited to Sanders and the influence of platform-committee members appointed by him. The platform featured a focus on economic issues, such as Wall Street reform, stronger financial regulation, and raising the minimum wage to $15 an hour. Liberal stances on social issues, such as a call for criminal justice reform and an end to private prisons, expansion of Social Security, and the abolition of the death penalty, also feature in the platform.

Senator Elizabeth Warren delivered the keynote address of the convention, with First Lady Michelle Obama and Bernie Sanders serving as headlining speakers on the first day. Former president Bill Clinton served as headlining speaker on the convention's second day, while Vice President Joe Biden and President Barack Obama headlined on day three. Tim Kaine gave his vice presidential nomination acceptance speech on the third day of the convention, while Chelsea Clinton introduced Hillary Clinton to give her presidential nomination acceptance speech on the final day. Clinton's speech was generally well received, and she would go on to have a 7% convention bounce in national polling. Various performers also appeared during the convention, including Elton John, Demi Lovato, Alicia Keys, Lenny Kravitz and Katy Perry. Overall attendance at the convention was estimated to be around 50,000, according to Anna Adams-Sarthou, a representative of the DNC Host Committee.

The convention was not without controversy, as it was subject to various conflicts between supporters of the presidential campaign of Bernie Sanders and the Democratic Party. In the week prior to the convention, various emails from the Democratic National Committee, the governing body of the Democratic Party, were leaked and published, showing bias against the Sanders' campaign on the part of the committee and its chair, Debbie Wasserman Schultz. Schultz subsequently resigned as chair of the committee, and thus as chair of the Democratic National Convention, with Congresswoman Marcia Fudge taking up the role of Convention chair. Some delegates in support of Sanders staged protests both outside and on the floor of the convention, opposing the nomination of Clinton and Kaine as the party's nominees for president and vice president, respectively.

Clinton and Kaine would go on to win the popular vote in the general election, but ultimately lost the election to the Republican ticket of Donald Trump and his running mate Mike Pence in the electoral college.

In 2016, the Republican and Democratic conventions were held in late July before the Rio de Janeiro Summer Olympics, instead of after the Olympics as in 2008 and 2012. One reason why the Republican Party scheduled its convention in July was to help avoid a longer, drawn-out primary battle (as in 2012). The Democrats then followed suit, scheduling their convention the week after the Republicans' convention, to provide a quicker response.

The formal bid process was initiated when, in February 2014, the Democratic National Committee sent out letters inquiring into the interest of a number of cities in hosting the 2016 convention. The cities were reported by CNN to have received these letters were Atlanta, Austin, Baltimore, Chicago, Cincinnati, Cleveland, Columbus, Dallas, Detroit, El Paso, Houston, Indianapolis, Kansas City, Las Vegas, Memphis, Miami, Milwaukee, Minneapolis, Nashville, New Orleans, New York City, Oakland, Orlando, Philadelphia, Phoenix, Pittsburgh, Portland, Sacramento, San Antonio, San Diego, San Francisco, Seattle, St. Louis, and Tampa.

In the spring of 2014, the Democratic National Committee sent requests for proposal inviting fifteen cities to bid for the convention. The fifteen cities sent requests for proposals were Atlanta, Chicago, Cleveland, Columbus, Detroit, Indianapolis, Las Vegas, Miami, New York City, Orlando, Philadelphia, Phoenix, Pittsburgh, and Salt Lake City.