Cook the bacon until crispy. Transfer to a paper towel-lined plate and allow it to cool before crumbling.
In a large mixing bowl, combine the sour cream, mayonnaise, and ranch seasoning until smooth.
Fold in the diced tomatoes, chopped chives, and most of the crumbled bacon, reserving a small amount for garnish.
Transfer the dip to a serving bowl and top with the remaining bacon and additional chives if desired.
Refrigerate for at least 30 minutes before serving to allow the flavors to blend.
Serve with crackers, toasted baguette slices, potato chips, pita chips, or fresh vegetables.