If you're on the hunt for cheap big bank stocks, then you'll want to take a look at Citigroup (NYSE:C), Regions Financial (NYSE:RF), and KeyCorp (NYSE:KEY), as well as the other two big bank stocks revealed in the slideshow below.

While there are undoubtedly reasons that the five big banks highlighted therein trade for measly price-to-tangible-book-value ratios, the potential upside associated with their low valuations nevertheless makes shares of Citigroup, Regions Financial, and KeyCorp seem attractive at first glance.

Data source: Valuation data for Citigroup, Bank of America, Capital One, KeyCorp, and Regions Financial was sourced from YCharts.com. 

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.