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.