Place the drained garbanzo beans in a large mixing bowl.
Add the drained tuna to the bowl, flaking it into bite-sized chunks using a fork.
Incorporate the diced cucumber, halved cherry tomatoes, and finely chopped red onion into the mixture.
In a small separate bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, salt, and pepper until the dressing is fully emulsified.
Pour the dressing over the salad ingredients and toss gently with a spatula to combine without mashing the beans.
Garnish with minced fresh parsley and serve at room temperature or chilled.