Sherry vinegar is a gourmet wine vinegar. In its place, you can substitute champagne, red or white wine vinegar, or juice from a lemon or a lime. Alternatively, since sherry vinegar has a smooth tone, you can swap it out for wine or fortified wine.
Using a replacement for sherry vinegar depends heavily on how you plan to prepare the recipe. Raspberry vinegar or red wine vinegar are appropriate substitutes for sweeter dishes. As a last resort, a smaller amount of distilled white vinegar does the trick. Moderation is key, so aim to use less of your alternative choice to avoid undesirable results.