The launch of the brand, which is known as Ár Ocean, follows a partnership with Mayo firm Ultrapure Laboratories.
The supply deal is worth around €1m for the Ballina-based business, Lidl reported.
Four Ár Ocean products will be permanently stocked across Lidl’s 220 stores in Ireland and Northern Ireland.
They include a cleanser, moisturiser, eye-cream and face serum.
The collection follows two years of collaboration between Lidl and Ultrapure Laboratories, with the products featuring ingredients such as Irish moss and sea minerals.
“We worked closely with Lidl to really capture the essence of the brand which shines through with Ár Ocean – naturally sourced, expertly formulated and 100pc Irish,” Ultrapure Laboratories owner John Dempsey said.
He added the range focuses on the “transformative properties” of sea moss and minerals.
“Our ambition for this collection is to provide customers with a quality, premium product at a low cost,” Lidl buyer Emma Nolan said.
“For us, the partnership further demonstrates our commitment to supporting Irish producers, with €1.6 billion procured last year from Irish suppliers and business partners,” she added.
Around €800m of the total procured from the agri-food industry in Ireland stayed within Lidl Ireland’s operations and was sold through its store network across the island of Ireland.
The remaining €300m was exported internationally to Lidl’s network of stores.
The retailer has around 1,800 suppliers and business partners in Ireland.
Lidl also invested €500m in services procured in Ireland last year.
This included work with Structural Design Solutions, a Mayo company, as well as Waterford’s Enerpower.
Enerpower was responsible for the installation and management of rooftop solar across 81 stores, two regional distribution centres and head office.
Earlier this year, the discount retailer also announced that every employee would receive a pay rise of around 6pc in 2024.
This is equal to, on average, €2,000 additional pay for every employee per year, the company said.
This followed a €15m investment for pay rises for its workforce in the Republic of Ireland, while a further £3m was invested in operations in Northern Ireland.