Yes, you can mix and match dining room chairs but it would be helpful if you kept the following points in mind, 1. Stick to one shape, just change colours – Different shapes can give a cluttered and disorderly look. Rather than having different shapes for each chair, change up the colours. 2. Alternate the arm chairs – You can opt for a different set of chairs like arm chairs to place on opposite ends of the table. 3. Mix benches and chairs – Using benches for dining tables are very trendy nowadays. Combine benches and chairs for a visually appealing look.