The Spring Peeper (Pseudacris crucifer) is a small chorus frog widespread throughout the eastern USA and Canada.

There are two subspecies of the Spring Peeper, the Northern (P. c. crucifer) and the Southern Spring Peeper (P. c. bartramiana). The Northern is similar to the Southern except for a strong dark marking on the Southern frog's belly. The Southern (P. c. bartramiana) is limited to northern Florida and southern Georgia, while the northern can be found all over the eastern USA and eastern Canada.

On Martha's Vineyard, peepers are commonly called "pinkletinks"; in New Brunswick, Canada, they are sometimes called "tinkletoes", although not commonly known by that name, and usually referred to as simply "peepers". On Nova Scotia's South Shore, they are sometimes referred to as "pink-winks."

Spring Peepers are tan or brown in color with a dark cross that roughly forms an X on their dorsa (thus the Latin name crucifer, meaning cross-bearer), though sometimes the marking may be indistinct. They have a body length between less than an 1 inch (25 mm) to 1.5 inches (38 mm) and a weight between 0.11 ounces (3.1 g) to 0.18 ounces (5.1 g).