The Sun’s defence editor, who is also one of the youngest to be taken into custody, is the 23-person to be arrested at News International.
Wheeler has been abroad on extended leave, but police had wanted to question her. It is understood she has returned to the country.
The woman was arrested by appointment on Thursday morning and is the 23rd person to be arrested by officers working on Operation Elveden. She is in custody at a south London police station.
She is the 11th Sun journalist to be arrested since last November. According to her profile on the Sun’s website, Wheeler is the Sun’s first female defence editor, the Guardian reports.