Customers are being urged not to eat the affected products, made in a factory on Teesside.
The biscuits, including cheese thins, shortbread, chip cookies and fudge brownies, were made by a company called Baketime, based in Middlesbrough.
"There has been no evidence of any contamination", it said.
But Baketime confirmed it had seen "evidence of pest activity" in January and again in March.
"We continue to work closely with our local environmental health officer and pest control contractor to ensure that the issue has been properly eradicated and hygienic standards on site are upheld," the company said in a statement.
Baketime, based at South Tees Imperial Food Park, said it was recalling all the biscuits and snacks as a precautionary measure. In the meantime they were being taken off sale.
The products are sold in Aldi and in small convenience stores around the UK.
The FSA said the biscuits and snacks had been manufactured in "unhygienic conditions", and that it was investigating further.
The affected products are:
Aldi Cheese Thins (10% Cheese) - L16026, L16027, L16055, L16056, L16057, L16073, L16074, L16075
Aldi Cheese Bakes - L16026, L16027, L16032, L16033, L16039, L16040, L16046, L16047, L16053, L16366, L16060, L16066, L16067, L16073
Aldi Oddbites Cheese - L16060
Aldi Oddbites Salt and Vinegar - L16061
Aldi Oddbites Smoky Bacon - L16061
Aldi Ginger Nuts - L16047, L16048, L16061, L16062, L16068, L16069
Bestway Mini All Butter Shortbread    L16034
Bestway Mini Brownies    L16035
Bestway Mini Cheese Thins    L16032, L16033
Bestway Mini Choc Chip Cookies    L16035
Happy Shopper Cheese Thins    L16026, L16027, L16032, L16053, L16366, L16060, L16066
Happy Shopper Fudge Brownies    L16041
Happy Shopper Choc Chip Cookies    L16041â€‹
LBV Potato Bakes Korma    L16034
LBV Potato Bakes Mild Thai    L16034
LBV Strawberry and Vanilla Biscotti    L16027

The coach, which was carrying a cheerleading team from Kent, collided with an Audi car near Flitwick at 06:45 GMT.
Two men from Buckinghamshire and a third from the London area, all of whom were in the car, died.
A fourth man, who was also in the car, has been taken to Oxford's John Radcliffe Hospital.
No-one on the coach was injured.
Bedfordshire Police said the double-decker coach collided with the Audi while it was stationary on the hard shoulder.
"The coach driver was arrested in connection with the incident and taken to Luton Police Station where he is being interviewed," a police spokesman said.
It is understood the cheerleading team are from a university in Kent and were on their way to a sporting event in Birmingham when the crash happened.
Tim Lambkin, director of Sheerness-based Travelmasters, said the cheerleaders were transferred to another vehicle and continued on their way after the collision.
Mr Lambkin said: "It is too soon to comment on the causes of what happened - we have to let the police experts do their work.
"Our hearts and thoughts go out to the families of those who died and the man hurt.
"In the 31 years I've been involved in the company I've never known anything like this."
Police have urged any witnesses to the accident to come forward.
A number of biscuits and snacks sold in the supermarket chain Aldi may have been contaminated by pests, the Food Standards Agency (FSA) has warned.
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A coach driver involved in a crash which left three people dead on the M1 in Bedfordshire has been arrested.