Life Style Sports will become the province's official retail partners and will operate Connacht Rugby's online and stadium retail platforms.
Speaking at the launch in Galway, Mark Stafford, Life Style Sports Group CEO, said: "This new partnership with Connacht Rugby is a very exciting development for us all at Life Style Sports.
"We see the association as so much more than just a logo on the front of a shirt. Like Connacht Rugby, Life Style Sports are passionate about sport and we are excited to be able to help Connacht and its fans engage in different ways throughout the year and across the province.
"The unique identity of Connacht Rugby together with its growing, loyal support base in the west and throughout Ireland provides an excellent fit for Life Style Sports and we look forward to promoting Connacht Rugby and our association with them through more than 63 stores across the country.
"The needs and wants of the Connacht supporter was a major focus for both parties during the negotiation process and we are delighted to offer distribution of Connacht merchandise as well as a discount on all products in all Life Style Sports stores for Connacht Season Ticket holders.
"With a revised European competition, new players, new coaching personnel and a new CEO in Willie Ruane coming in, it is a hugely exciting time for Connacht Rugby and its supporters and we are really looking forward to playing our part."
Alex Saul, head of marketing & commercial at Connacht Rugby, added: "Life Style Sports are an exciting and innovative Irish-owned company and their investment will help to drive Connacht Rugby forward.
"We are constantly looking at opportunities for our passionate supporter base to engage with the province and Life Style Sports will help provide a strong presence in stores around the country, enabling the Connacht Clan access to a wide range of clothing, equipment and merchandise.
"We look forward to working with the team at Life Style Sports and welcoming them to the rugby family."
The 2014/15 Connacht playing jerseys will be revealed in August with the full supporters' range available in stores and online at lifestylesports.com from early September.