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Rare White Blend is a term Wine-Searcher uses to group together white wines made from uncommon or unusual grape variety blends (see also Rare Red Blend). The category also provides a convenient home for wines whose blend is either unknown or not published by the winery.

There is no particular pattern or formula for establishing which grape varieties will features in these rare blends, nor the proportions in which they will be used. Some will consist of just two components, others may contain ten or more.

Unlike the Champagne Blend and Bordeaux Blend, which draw from a relatively narrow selection of potential grape varieties, the Rare White Blend is – almost by definition – relatively complex. A classic example is the sparkling wine made by a well-known Chilean winery, from Chardonnay, Sauvignon Blanc, Moscatel and hand-picked Patagonian strawberries.

Several of the world's wine regions have developed their own signature blends over time. The most obvious of these is the southern Rhone Valley, where many wines are made from a mix of the traditional, local varieties (see Southern Rhone Red and Southern Rhone White).

There are various reasons why a wine might be made from a rare or complex blend. Some are viticultural – the wine may be a field blend of whichever varieties happen to be in the vineyard. Some are oenological – the winemaker have carefully selected each of the varieties to achieve a particular effect. Some are purely economic – the wine might be blend of whatever is left over from more carefully assembled blends.