Officers had been searching for the 36-year-old, from Petworth in West Sussex, since 22:00 BST on Thursday.
Ms Weeks, who plays Samantha Stewart in ITV drama Foyle's War, had last been seen 14 miles away in Chichester.
Sussex police said she had been "found safe and well, and is with police". Her actress sister Perdita Weeks had earlier tweeted: "Safe and sound thank you all xxxx".
Officers had said they were concerned for Honeysuckle Weeks' welfare and it was unlike her not to get in touch. She had recently told family and friends she was feeling anxious.
Her agency, the Artists Partnership, said it had been "unable to get hold of Honeysuckle".
Earlier this year the Cardiff-born star was reportedly ordered to wear an electronic tag after she was caught speeding on the A3 in south-west London in August 2015.
A child in the back seat had not been wearing a proper seat belt and it emerged Ms Weeks had already been banned from driving.
Ms Weeks recently finished work on shooting Lewis for ITV and a Sky mystery The Five.
She has also appeared in The Bill, The Inspector Lynley Mysteries and Death In Paradise.

Guy Hedger was shot by intruders who entered a house in St Ives, near Ringwood, Dorset, just after 03:00 BST on Sunday. He later died in hospital.
The men, who wore balaclavas, stole jewellery including designer watches before fleeing the property.
No arrests have been made and police have not recovered the shotgun used to kill the 61-year-old.
A helicopter was used to search the area following the shooting, which police believe was a planned burglary that turned violent.
Detectives said a second person who was in the Â£1m Castlewood property at the time of the break-in was "deeply affected by the incident" and is currently being supported by specially trained officers.
He lived in the property with his husband of 12 years, Simon-Pierre Hedger-Cooper, according to the Press Association.
Det Ch Insp Sarah Derbyshire said: "At this stage we are still trying to establish exactly what happened at the address and how and why the victim was shot dead.
"I am appealing for anyone who may have seen or heard anything suspicious in the area, or was in the area at that time, to contact Dorset Police as soon as possible."
A spokesman for his former employer, insurance firm Liverpool Victoria (LV), said: "We were all shocked to hear that our friend and colleague Guy Hedger... died over the weekend in such tragic circumstances.
"Our heartfelt condolences and sympathy are with his family and loved ones at this incredibly sad time."
Through his work as marketing and brand director at LV, Mr Hedger became a director at Avonbourne International and Business and Enterprise Trust, which runs colleges and a primary school in the Bournemouth area.
The trust's CEO Debbie Godfrey-Phuare said: "Guy was a very kind and generous man who volunteered and gave his time freely to Avonbourne.
"[He] had a deep passion for education and was dedicated to expanding the experience and knowledge of children in Bournemouth."
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Missing actress Honeysuckle Weeks has been found safe, police have said.
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Police are searching for at least two people over the shooting of a marketing executive who was shot in his own home.