Plana Baixa

{{Infobox settlement

| name = Plana Baixa

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| settlement_type = Comarca

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| image_map = Localització de la Plana Baixa respecte del País Valencià.svg

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| subdivision_type = Country

| subdivision_name = {{flag|Spain}}

| subdivision_type1 = {{No wrap|Autonomous community}}

| subdivision_name1 = {{flag|Valencian Community}}

| subdivision_type2 = Province

| subdivision_name2 = 15px Castellón / Castelló

| seat_type = Capital

| seat = 15px Burriana / Borriana

| parts_type = Municipalities

| parts_style = coll

| parts = {{No bold|20 municipalities}}

| p1 = Aín, Alcudia de Veo, Alfondeguilla, Almenara, Alquerías del Niño Perdido, Artana, Betxí, Burriana, Chilches/Xilxes, Eslida, La Llosa, Moncofa, Nules, Onda, Ribesalbes, Suera/Sueras, Tales, La Vall d'Uixó, Villarreal/Vila-real, La Vilavella

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| area_total_km2 = 605.15

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| population_footnotes = Official estimate as at 1 January 2019: Instituto Nacional de Estadística, Madrid, 2019.

| population_total = 190925

| population_as_of = 2019

| population_density_km2 = auto

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| blank_name_sec1 = Most populated municipality

| blank_info_sec1 = Villarreal / Vila-real

| timezone1 = CET

| utc_offset1 = +1

| timezone1_DST = CEST

| utc_offset1_DST = +2

| postal_code_type = Postal code

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Plana Baixa ({{IPA|ca-valencia|ˈplana ˈbajʃa|lang}}; {{langx|es|Plana Baja}} {{IPA|es|ˈplana ˈβaxa|}}) is a comarca in the province of Castellón, Valencian Community, Spain.

The main source of water for irrigation in the area is the Millars River.