Cowell, 55, said he was "overwhelmed" by the messages of support he received after his mother Julie Brett died of a stroke, aged 89, reported Female First.
"My family lost someone very special on Sunday. My Mum. I am overwhelmed with gratitude for all of the kind messages received. Thank you," Cowell posted on his Twitter page.
Earlier, announcing Julie's death, Cowell and his family said they were heartbroken and would "miss her terribly".
Cowell will begin filming auditions for "The X Factor" with Nick Grimshaw, Rita Ora and Cheryl Fernandez-Verscini.
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