The announcement was made by First Minister Nicola Sturgeon and meets a key manifesto pledge by the SNP in the May elections.
This will mean that young people in Midlothian will have their opportunities to learn, work and travel opened up by the scheme.
Research from Transport Scotland has revealed that 70 per cent of young people would use the bus more often if it was free.
Commenting on the news, SNP MSP for Midlothian South, Christine Grahame, said: “Once again this is a demonstration of how the SNP Scottish Government continues to support young people in Midlothian and across Scotland have the best possible start in life.”
Edinburgh crime news: Teenage boy arrested after riding motorbike in a 'dangerous manner in a public place'
Edinburgh fire: Blaze breaks out at Franco's fish and chip shop in Newington
Edinburgh fire: ‘I knew I had to just get out’: Residents evacuated as fire breaks out in Newington area of Edinburgh
Crime: Teenage thug who fathered a child during sentence is back behind bars
A 'deteriorating' footbridge over the Water of Leith has been closed
She added: “The SNP Scottish Government is once again making an investment in our young people’s future. By making bus travel free for under 22s in Midlothian and across Scotland, opportunities for young people to work, travel and study are being opened up for them.
“Travelling by bus is one of the most environmentally friendly way to get across the country and research shows that young people recognise the vital role public transport will play in hitting our climate change targets.
“This move will not only be vital in our journey to net zero, but will also take pressure off young people and their families’ finances.”