The incidents occurred at a petrol station, and two grocery shops.
A man in his 30s is due in court in connection with three robberies in the midlands.
The incidents occurred yesterday in Tullamore at Apple Green Service Station on Main Street at 9.30am, Lidl, Main Street, at 2 o'clock and Dunnes Stores at 2.15pm.
The culprit entered the stores and pushed a member of staff and took cash from the till.
No one was injured in the incidents and no weapons were used.
The man was arrested and was detained at Tullamore Garda Station and is to appear before Portlaoise District Court this morning.
Gardaí are appealing for anyone who witnessed anything to contact them.
Almost €446,000 Allocated To Midlands Community Centres And Clubhouses
Midlands Family Takes On Ireland’s Fittest Family Challenge
5K Fundraiser To Support Motor Neurone Disease Association Takes Place In Westmeath
No Slowing Down With Age As Westmeath Bowlers Shine At 14th Annual National Bowls Competition
Woman Appears In Court Over €280k Cannabis Seizure In Midlands
Status Yellow Fog Warning Issued For Leinster, Munster And Galway
Call For More Public Toilets Across The Midlands And Beyond