P6, P-6, or P.6 may refer to:

Howard Allan Stern (born January 12, 1954) is an American radio personality, television host, author, actor and photographer best known for his radio show which was nationally syndicated from 1986 to 2005. He gained wide recognition in the 1990s where he was labeled a "shock jock" for his outspoken and sometimes controversial style. Stern has been exclusive to Sirius XM Radio, a subscription-based satellite radio service, since 2006. The son of a former recording and radio engineer, Stern wished to pursue a career in radio at the age of five. While at Boston University he worked at the campus station WTBU before a brief stint at WNTN in Newton, Massachusetts.

He developed his on-air personality when he landed positions at WRNW in Briarcliff Manor, WCCC in Hartford and WWWW in Detroit. In 1981, he was paired with his current newscaster and co-host Robin Quivers at WWDC in Washington, D.C. Stern then moved to WNBC in New York City in 1982 to host afternoons until his firing in 1985. He re-emerged on WXRK that year, and became one of the most popular radio personalities during his 20-year tenure at the station. Stern's show is the most-fined radio program, after the Federal Communications Commission (FCC) issued fines to station licensees for allegedly indecent material that totaled $2.5 million. Stern has won Billboard's Nationally Syndicated Air Personality of the Year award eight times, and is one of the highest-paid figures in radio.

Louis Szekely (born September 12, 1967), known professionally as Louis C.K. ( /ˈluː.iː ˈsiːkeɪ/), is an Emmy and Grammy award winning Mexican-American stand-up comedian, radio host, television and film writer, actor and director. He is the star of the FX comedy series Louie, which he also writes, directs, and edits, although starting with the third season he will no longer edit.

C.K.'s stage name is derived from an approximate English pronunciation of his Hungarian surname, Szekely (Hungarian pronunciation: [ˈseːkɛj]). C.K. was born in Washington, D.C., the son of Mary Louise (née Davis), a software engineer, and Luis Szekely, an economist. C.K.'s paternal grandfather, a Jewish Hungarian, emigrated to Mexico, where he met C.K.'s paternal grandmother, who was a Catholic Mexican of Spanish and Mexican Indian ancestry. C.K.'s father was born in Mexico and C.K.'s mother is an American of Irish Catholic ancestry. The two met at Harvard University while his father was trying to finish his degree during a summer-school program. Although C.K. was born in D.C., he lived in Mexico City until the age of seven. His first language is Spanish, and he still retains Mexican citizenship.