Third party is often used to refer to a person or entity who is not involved in an interaction or relationship. It may refer to:

Gary Earl Johnson (born January 1, 1953) is an American businessman, a former Governor of New Mexico, and the Libertarian Party nominee for President of the United States in the 2012 election. Johnson served as the 29th Governor of New Mexico from 1995 to 2003, as a member of the Republican Party, and is known for his low-tax libertarian views and his regular participation in triathlons.

Johnson founded one of New Mexico's largest construction companies. He entered politics for the first time by running for Governor of New Mexico in 1994 on a fiscally conservative, low-tax, anti-crime platform. He beat incumbent Democratic governor Bruce King by 50% to 40%. He cut the 10% annual growth in the budget: using his gubernatorial veto 200 times during his first six months in office. His use of the veto over his two terms gained him the nickname "Governor Veto".

Johnson sought re-election in 1998, winning by 55% to 45%. In his second term, he concentrated on the issue of school voucher reforms, as well as campaigning for marijuana decriminalization. During his tenure as governor, Johnson adhered to an anti-tax and anti-bureaucracy policy, setting state and national records for his use of veto powers: more than the other 49 contemporary governors put together.Term-limited, Johnson could not run for re-election at the end of his second term.

Jill Stein (born 1950) is an American physician and candidate for President of the United States in 2012 with the Green Party of the United States. Stein was a candidate for Governor of Massachusetts in the 2002 and the 2010 gubernatorial elections. Stein is a resident of Lexington, Massachusetts and a 1979 graduate of Harvard Medical School. She serves on the boards of Greater Boston Physicians for Social Responsibility and MassVoters for Fair Elections, and has been active with the Massachusetts Coalition for Healthy Communities.

In October 2011, Stein announced her candidacy for the presidential nomination of the Green Party in the 2012 general election.

Stein advocates for the creation of a "Green New Deal", the objective of which would be to employ "every American willing and able to work" to address "climate change...[and the] converging water, soil, fisheries, forest, and fossil fuel crises" by working towards "sustainable energy, transportation and production infrastructure: clean renewable energy generation, energy efficiency, intra-city mass transit and inter-city railroads, “complete streets” that safely encourage bike and pedestrian traffic, regional food systems based on sustainable organic agriculture, and clean manufacturing of the goods needed to support this sustainable economy". The initial cost of the Green New Deal would be funded by various mechanisms, including "taxing Wall Street speculation, off shore tax havens, millionaires and multimillion dollar estates" as well as a 30% reduction in the U.S. military budget. She cites a study of the economic effects of the 1930s New Deal projects by Dr. Phillip Harvey, Professor of Law & Economics at Rutgers School of Law as academic evidence for the Green New Deal.