Event memory and misinformation effects were examined in an adult gorilla (Gorilla gorilla gorilla). The gorilla witnessed a series of unique events, involving familiar people engaging in a novel behaviors (Experiment 1), novel people engaging in novel behaviors (Experiment 2), or the presentation of novel objects (Experiment 3). Following a five to ten-minute retention interval, testers gave the gorilla three photographs on wooden cards: the correct item and two distractors. The gorilla was reinforced if he responded by returning the correct photograph. Across three experiments, the gorilla performed above chance at recognizing targets. In Experiment 4, the gorilla showed at-chance performance when the event was followed by misinformation (a class-consistent incorrect photograph), but above-chance performance when no misinformation occurred (correct photograph or no photograph).