Ben Bradshaw took to Twitter to post a picture and comment on the situation, as the leak is reportedly coming from upstairs.
He tweeted: "Urine seems to be pouring through the ceiling into my Commons office for the second day running!
"[Upstairs is] a men's urinal with ageing copper piping with holes."
An aide told BBC News: "The whole office smells of urine... It's dripping from a corner. We've got a bucket underneath.
"It started yesterday and they fixed it, but it's started again today. The House authorities are aware and they are getting it sorted."
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