Tayabas Bay

{{Short description|Large bay in southern Luzon}}

{{More citations needed|date=June 2025}}

{{Use Philippine English|date=January 2023}}

{{Use mdy dates|date=January 2023}}

{{Infobox body of water

| name = Tayabas Bay

| image = Marinduque 2.JPG

| caption = The island of Marinduque within the bay with the coast of Quezon in the background

| image_map =

| pushpin_map = Luzon mainland#Philippines

| pushpin_map_alt =

| pushpin_label_position =

| pushpin_map_caption = Location in Luzon##Location in the Philippines

| image_bathymetry =

| caption_bathymetry =

| location = Luzon Island, Philippines

| coordinates = {{coord|13|37|37|N|121|46|30|E|region:PH_type:waterbody|display=inline,title}}

| type = bay

| rivers =

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| length =

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| frozen =

| islands = Marinduque

| cities = {{hlist | Agdangan | Boac | Buenavista | Catanauan | Gasan | General Luna | Lobo | Lucena | Macalelon | Mogpog | Mulanay | Padre Burgos | Pagbilao | Pitogo | San Francisco | San Juan | Santa Cruz | Sariaya | Torrijos | Unisan}}

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Tayabas Bay is a large bay in the southern part of Luzon island in the Philippines. Several islands are located in the bay, largest of which is Marinduque. It has a total surface area of {{convert|2,500|km2|abbr=on}}.

The bay is bordered on the north and east side by Quezon (formerly known as Tayabas) province and San Juan, Batangas.{{cite news |last1=Jr |first1=Delfin T. Mallari |title=Plan to quarry Tayabas Bay opposed anew |url=https://newsinfo.inquirer.net/1822018/plan-to-quarry-tayabas-bay-opposed-anew |access-date=2 June 2025 |work=INQUIRER.net |date=26 August 2023 |language=en}} Lucena, the capital city of Quezon Province, is located along Tayabas Bay, where several boat and ferry lines serve the sea lanes between Lucena and the different points in the region.

Several fauna are found in Tayabas Bay. Among them are whale sharks (Rhincodon typus){{cite news |title=WATCH: Close encounter with whale sharks in Tayabas Bay, Quezon |url=https://www.rappler.com/philippines/luzon/tayabas-quezon-whale-shark-encounter/ |access-date=2 June 2025 |work=RAPPLER |date=26 November 2022}} Sea turtles such as Lepidochelys olivacea, Eretmochelys imbricata, and Chelonia mydas also lay eggs in the bay.{{cite news |last1=Mallari Jr |first1=Delfin T. |title=Over 5,000 baby turtles released in Tayabas Bay |url=https://newsinfo.inquirer.net/1884898/over-5000-baby-turtles-released-in-tayabas-bay |access-date=2 June 2025 |work=INQUIRER.net |date=7 January 2024 |language=en}} However, these turtle hatchlings are threatened by baklad or fish traps within the bay.{{cite news |last1=Mallari Jr |first1=Delfin T. |title=Fish traps pose deadly threat to baby turtles in Tayabas Bay |url=https://newsinfo.inquirer.net/1556728/fish-traps-pose-deadly-threat-to-baby-turtles-in-tayabas-bay |access-date=2 June 2025 |work=INQUIRER.net |date=19 February 2022 |language=en}}