Bring a large pot of lightly salted water to a boil. Cook orzo in the boiling water, stirring occasionally until tender yet firm to the bite, about 10 minutes. Drain; transfer to a large bowl.
Add chickpeas, kidney beans, black beans, green onions, red onion, bell peppers, corn, cilantro, salt, and black pepper to the bowl. Drizzle oil and lime juice over salad, toss to coat. Refrigerate to chill before serving, at least 2 hours.
Mexican Orzo Salad · Dinner Match Lab | Dinner Match Lab