The eccentric singer - who caused controversy earlier this week when she appeared to smoke a cannabis-filled cigarette on stage in Amsterdam - keeps a detailed record of her life on the road as a memento to hand down to her children in years to come, but would also consider making the journals public.
A source told the Daily Star newspaper: "As she tours the world, Gaga notes everything down in her journal.
"It contains her thoughts, feelings, sketches, pictures and even letters between herself and mum Cynthia.
"She keeps it all together as a memento, so that if she ever has children they`ll be able to read all about their pop star mum.
"Gaga also says that one day she would consider allowing it to be published, if the timing was right."
However, if the `Bad Romance` star did publish her diaries, it wouldn`t be for profit.
The source added: "She often talks about how funny it would be to publish it. But if she did, her decision wouldn`t be based on money, it would be for the fans. Gaga would consider it to be a gift to them."