Ummah (Arabic: أمة‎) is an Arabic word meaning "community" or "nation." It is commonly used to mean either the collective nation of states, or (in the context of pan-Arabism) the whole Arab world. In the context of Pan-Islamism, the word ummah is used to mean the diaspora^{[citation needed]} or Commonwealth^{[citation needed]} of the Believers (ummat al-mu'minin), and thus the whole Muslim world.

The phrase Ummah Wahida in the Qur'an (the "One Community") refers to all of the Islamic world unified. The Quran says: “You [Muslims] are the best nation brought out for Mankind, commanding what is righteous (Ma'ruf, lit. "recognized [as good]") and forbidding what is wrong (Munkar, lit. "unrecognized [as good]")…” [3:110].

On the other hand, in Arabic Ummah can also be used in the more Western sense of nation, for example: Al-Umam Al-Muttahida, the United Nations.

The Constitution of Medina, an early document said to have been negotiated by Muhammad in AD 622 with the leading clans of Medina, explicitly refers to Jewish and pagan citizens of Medina as members of the Ummah.

Megyn Marie Kelly (born November 18, 1970), formerly known as Megyn Kendall, is an American journalist and news anchor employed by the Fox News Channel. Kelly currently hosts America Live from 1:00 PM to 3:00 PM EST live from the network’s New York City headquarters. She occasionally also co-hosts on America's Newsroom along with Bill Hemmer during the Fox Channel Network's Morning Line-Up at 10:00 AM EST. Since 2007, the two have hosted Fox News Channel's New Year's Eve special every year.

Kelly was nine years of age when her parents moved to Delmar, New York from Syracuse, New York. At Bethlehem Central High School, she played on the basketball and field hockey teams, as well as captaining the cheerleading squad. Kelly's father, who was on the staff of the University at Albany, died when she was 15. After high school, she pursued an undergraduate degree in Political Science from Syracuse University and later pursued a J.D. from Albany Law School; she served as an associate editor of the Albany Law Review while enrolled at Albany Law School. Kelly's first marriage to Daniel Kendall, an anesthesiologist, ended in divorce in 2006. In 2008 she married Douglas Brunt, the President and CEO of Authentium, at Oheka Castle in Huntington, New York. They have two children: Edward Yates Brunt (September 25, 2009) and Yardley Evans Brunt (April 15, 2011).

Khalid Yasin (also known as Abu Muhammad and Abu Muhammad Khalid Yasin) (born in 1946) is an American convert from Christianity to Islam who lectures in the United Kingdom and elsewhere.Yasin lives in Manchester, England and has operated a "da'wah" organization which has had various names. It was dissolved in 2010.Yasin frequently travels overseas to spread his faith. He has called himself a "media-bedouin," remarking that the bedouins are willing to settle wherever there is "water and shelter". Yassin is outspoken about a variety of issues in his speeches and media appearences.

Yasin was born in Harlem, New York and raised in Brooklyn as a Christian along with nine siblings. Although not an orphan, he grew up in foster homes from the age of three, along with some of his siblings, until he was fifteen. He describes each foster home as having a different Christian denomination, so he covered a wide spectrum of Christianity. He was put up for adoption due to his family's financial state.

Yasin has described his youth in "the ghetto", where it was "Me and my two brothers Sam and Julius, against the world. We had nothing but converting and accepting Islam now we have everything". When first reading about Islam, he often used Encyclopedia Britannica as a reliable source on Islam and its concepts. Yasin felt the grief of African-American people, and he was especially influenced by the turbulent 1960's and figures like Malcolm X.