A bilingual sign (or, by extension, a multilingual sign) is the representation on a panel (sign, usually a traffic sign, a safety sign, an informational sign) of texts in more than one language. The use of bilingual signs is usually reserved for situations where there is legally administered bilingualism (in bilingual regions or at national borders) or where there is a relevant touristic or commercial interest (airports, rail stations, ports, border checkpoints, tourist attractions, international itineraries, international institutions, etc.)

Bilingual signs are widely used in regions whose native languages do not use the Latin alphabet; such signs generally include transliteration of toponyms and optional translation of complementary texts (often into English). Beyond bilingualism, there is a general tendency toward the substitution of internationally-standardized symbols and pictograms for text.

The use of bilingual signs has experienced a remarkable expansion in recent times, especially in the western world.^{[citation needed]} The increase in bilingualism there has been paralleled by increases in international travel and a greater sensitivity to the needs of ethnic and linguistic minorities.