The superstar, formerly of boy band One Direction, is thought to be filming a new movie – My Policeman – according to some fans.
One said on Twitter: “Apparently this is the base being used for Harry Styles new film? He’s been spotted around Worthing, that’s all I know though.”
Another added: “Harry Styles, multi-platinum selling artist and actor...is in Worthing and Durrington filming something.”
And one joked: “@Harry_Styles can’t believe you’re in worthing and haven’t popped round mine for a cup of tea?”
Large numbers of film set trailers have been spotted at Worthing Leisure Centre and the popstar was also spotted in Steyne Gardens.
One eyewitness told this newspaper: “Harry Styles was outside of the police station today in Worthing.
“And then outside of the custody block in Durrington.
“He was well disguised but you’d notice Harry any day!”