Liêm Hoang-Ngoc (French pronunciation: [ljɛm ɔɑ̃ŋ ɡɔk]; born 11 December 1964 in Saigon, South Vietnam) is a Vietnamese-born French economist and Member of the European Parliament[1] elected in the 2009 European election for the East France constituency as a member of the French Socialist Party.

During his time as a Socialist, he was known to sympathise with the left of the party, and was close to Henri Emmanuelli.

In the 2009 European elections, he was placed second on the Socialist list for the East region.

He was a candidate in the 2017 French legislative election, in the 4th district of Haute-Garonne, as a member of La France Insoumise.

Liêm Hoang Ngoc who joined the political movement La France Insoumise then in early July 2018, suspended his relationship with this group for which he co-authored the economical programme.