The lender has entered the market with a product for house purchasers and remortgaging, available at 2.89 per cent at up to 75 per cent loan to value.
It also comes with a free valuation and a £495 product fee.
The lender joins Virgin Money, which launched a 15-year fix earlier this summer.
Accord said it was responding to customer demand for longer-term fixes, with five-, seven-, 10- and 15-year fixed rate products available.
Jemma Anderson, product manager at Accord Mortgages (pictured) said: “Customer needs are changing and for borrowers looking to purchase or renew their home loans, securing a fixed rate for longer can provide peace of mind.
“We are launching the 15-year fixed rate to offer additional longer-term options for brokers to discuss with their clients, ensuring they can find the best product for their circumstances.”
Yorkshire Building Society, parent to Accord Mortgages, has also launched a range of 15- year mortgages, including the same deal available through brokers.
