Christopher Sieber (born February 18, 1969 in St. Paul, Minnesota) is an American actor and musical theatre performer. Christopher's middle name is Luvern afer his maternal grandfather. Luvern is also a city in Minnesota, which could have prompted such a family name. Sieber is the middle sibling of Michael (eldest) and Marc (youngest).

Sieber studied acting and musical comedy at The American Musical and Dramatic Academy in New York City. He made his Broadway debut as Agis in the musical Triumph of Love with Betty Buckley and F. Murray Abraham. Following his role in Triumph of Love he appeared as a replacement in the roles of Gaston in Beauty and the Beast, Trevor Graydon in Thoroughly Modern Millie and Billy Flynn in Chicago. Sieber was also cast in the role of Rapunzel's Prince in the revival of Into the Woods in 2002.

In late 2004, Sieber originated the role of Sir Dennis Galahad in the Broadway musical, Monty Python's Spamalot which is an adaptation of the 1970s motion picture, Monty Python and the Holy Grail. Spamalot premiered in March 2005 where Sieber sang a love duet with Sara Ramirez that spoofed the genre, The Song That Goes Like This. Sieber was nominated for a Tony Award for Best Featured Actor in a Musical in 2005. After leaving the cast in July 2006, he made his London debut in the same role in October 2006, before leaving early 2007.

Sieber's off-Broadway credits include The Boys in the Band (revival) and Avow. In Avow, Sieber and his partner have a confrontation with a Catholic priest over seeking same sex marriage in the Church. In addition to theatre, he has starred in two television series, Two of a Kind with the Olsen twins and It's All Relative with John Benjamin Hickey and Harriet Sansom Harris.

In early 2007, Sieber was scheduled to film a pilot episode for an NBC comedy, "Wildlife", playing an eccentric zoologist. The pilot did not make the final cut and was not picked up as part of NBC's nightly schedule for the Fall of 2007.

On June 1, 2007, Sieber sang Tenor in the world premiere of Eric Idle's Not the Messiah (He's a Very Naughty Boy) in Toronto.

While It's All Relative was being produced, Sieber announced that he was gay and happily partnered to actor Kevin Burrows.

Sieber is heavily involved in Broadway Cares/Equity Fights AIDS (BC/EFA) and has appeared in several of its Broadway Bares revues, among other events the charity produces.

Sieber frequently attends theatre in New York, teaches master classes and enjoys riding his bike. He moved to Lake Tamarack New Jersey not too long ago, and lives in the middle of the lake in a house on an island.

On January 18, 2008, Sieber returned to Broadway to resume his role as Sir Dennis Galahad in the Broadway musical, Monty Python's Spamalot.

He attended Forest Lake High School and, after graduating, set out for New York to study acting at the American Music and Dramatic Academy. Sieber made his television series debut in "Two of a Kind" (1998). In regional theatre, he has been involved in a string of world premiere musicals, including Randy Newman (I)'s "Faust" at La Jolla Playhouse, Bill C. Davis and Richard Adler's "Off-Key" at the George Street Playhouse and Larry Grossman (I)'s "Paper Moon" at Papermill Playhouse. For television, he has appeared in numerous commercials and in the daytime dramas, "All My Children" (1970) and "Another World" (1964).