International Versions Edit
|Australia||What's My Line?||John Barnes||TCN-9 (1956-1958)|
|Brazil||Adivinhe o que ele Faz? (Guess What He Does?)||Heloísa Helena||1950s|
|Canada (French)||Chacun son Metier (To Each His Job" or "To Each His Trade)||Louis Morisset||1954 to 1959|
|Chile||¿Quién Soy Yo? (Who Am I?)||Enrique Bravo Menadier||Canal 13 (1967-1970), TVN (1970-1979)|
|Czech Republic||Hádej kdo jsem? (Guess Who I am !)||Petr Vondracek||Prima TV (2007-present)|
|England||What's My Line?||Gilbert Harding (first episode), Eamonn Andrews (1951-1963, 1984-1987), David Jacobs (1973-1974), Penelope Keith (1988), Angela Rippon (1989-90), Emma Forbes (1994-97), Hugh Dennis (2005 special), Stephen K. Amos (2011 special)||BBC (1951-1963), BBC 2 (1973-1974)ITV (1984-1990), HTV and Meridian (1994-1997), BBC Four (2005, special), BBC.co.uk webcast (2011, special)|
|France||Jouons Le Jeu||RTF (1951-1952)|
|Germany||Was bin ich? (What am I?)||Robert Lembke (1955-1958, 1961-1989), Björn Hergen Schimpf (1999-2005)||ARD (1955-1958, 1961-1989), Kabel 1 (1999 2005)|
|Indonesia||Kuis Siapa Dia (Who He/She Is)||Aom Kusman (1992-1998)|
Denny Chandra (2013)
Ananda Omesh (2014-2015)
|TVRI (1992-1998, 2013)|
Trans 7 (2014-2015)
|Italy||Cosa fa il Signor X?||Fulvia Colombo||1955-1956|
|Lithuania||Kas tu toks? (Who Are You?)||Vytenis Sinkevicius||Lietuvos Rytas Television (2010-present)|
|Spain||Adivine su vida (Guess your life)||TVE (1960-1961)|
|Venezuela||Mi Trabajo y Yo (My Job and I)||Renny Ottolina||RCTV (1960)|
- The Chilean version was part "To Tell the Truth" and part "What's My Line?".
- The Taiwanese version aired on the radio, according to an interview with Mark Goodson and Bill Todman.
- There was also a pirated version that aired in Havanna, Cuba. According to an interview, Mark Goodson called the producer and asked him where he got the show. "We took it from a kinescope of a show like it in New York," the producer explained. "I created this show," Goodson said. "You created this show? You must be very intelligent," the producer replied.