Plenti was an American rewards program created by American Express in 2015 and discontinued in 2018. During its operation, Plenti let users earn points at one retailer and use them at the same or other retailers that were enrolled in the program.

Plenti launched on May 4, 2015. It allowed shoppers to earn rewards through a variety of purchases. Unlike other loyalty programs such as supermarket loyalty programs, Plenti was not tied to a single company or credit card issuer. Users could join for free and did not have to be American Express cardholders.

Plenti was part of American Express' push to broaden its reach following the loss of its exclusive deals with Costco (which switched to Citi and Visa) and JetBlue (which switched to Barclays and MasterCard).

When 2017 ended, Direct Energy, Hulu, Nationwide, Enterprise, Alamo, and Expedia left Plenti. On January 31, 2018, Macy's and Chili's announced that they were also leaving Plenti.

An online marketplace where users could earn Plenti points through online retailers such as Walmart, Sam's Club, Target, Home Depot, Lowe's, and Under Armour was available from May 2015 through March 15, 2018. A member would log into the marketplace and then be directed to the desired retailer's website, thereby earning points for their account. At least one point was earned per $1 spent.

On April 16, 2018, Plenti confirmed that the program would end on July 10, 2018; it suspended new account sign-ups effective immediately.

Retailers that participated in Plenti until 2018:

Retailers that left Plenti in 2017: