Rupa Huq, who represents Ealing Central and Acton, was speaking after attending a church service at the Ukrainian Orthodox Church in Acton on Saturday to mourn the deaths of up to ten million people in 1932-33.
Some experts have said Josef Stalin, Russia's leader at the time, purposely starved the nation to suppress increasing desires for independence from the Soviet Union.
More than ten countries including Ukraine formally recognise the USSR's actions as a genocide.
Huq told the Commons: "It's an atrocity that was exposed by British journalists yet the British government still fails to acknowledge this as genocide.
"Could we have an urgent statement on why we haven't followed other countries in doing this?
"These people feel swept under the carpet and they need our solidarity, they are under attack again."
Commons Leader David Lidington replied: "The principle that the Government follows, I think you know, is that we believe that the term genocide, because it these days carries certain potentially criminal implications in respect of those alleged to have carried out genocidal acts, these are decisions that should be made by judges rather than by governments but that should not diminish in any way our sense of horror at what happened in Ukraine during the 1930s.
"We are right to remember the horror that took place then and do all in our power to try to make sure through our foreign policy that such events never happen again."
