Network Rail and Arrive Trains Wales will invest over £1m to the programme and hope it will encourage more people to use train services.
Mike Bagshaw, Commercial Director of Arriva Trains Wales said:
"We are very excited about these improvements and are pleased to be involved in programmes that support a safe, accessible and sustainable transport network across Wales.
"Our investment in this series of projects will build on the £30 million Arriva Trains Wales has invested over the last 10 years to improve stations, staff facilities and training, service availability and ticket purchase opportunities."
Mark Langman, Route Managing Director of Network Rail said:
"The aim of the scheme is to revitalise the station environments by making noticeable and lasting improvements for the benefit of passengers.
"Stations are the shop window for the railway and we hope this improvement programme will encourage even more people on to the trains at a time when we are seeing record passenger numbers."
Speaking at Port Talbot Parkway station this morning, where work will begin next week, Transport Minister Edwina Hart told ITV News today's investment will help improve passenger experience and encourage the use of public transport.
I am very pleased to see work start on this programme of improvements which will transform five stations across Wales. Using European funds, this programme will help meet our objectives of delivering a modern, accessible and affordable rail system for Wales.
Trains are a vital service for many people to access jobs and services. We want to make our rail stations accessible to all and ensure a pleasant experience for passengers. Provision of extra park and ride spaces is an important part of our strategy to reduce reliance on the car for people to get to work or go shopping.