In a medium mixing bowl, combine one can of drained tuna, mayonnaise, diced celery, and chopped green onions. Mix until well combined, adjusting seasoning with salt and pepper to taste.

Lay a nori sheet flat on a clean surface. Spread a portion of the tuna salad mixture onto the nori, leaving about an inch of space at the edges.

Starting from the edge where the filling is placed, roll the nori sheet over the filling, tucking tightly. Moisten the edge of the nori with water to seal securely.

Once rolled, use a sharp knife to slice the wrap into bite-sized pieces. Arrange on a serving platter and serve immediately.