地形测量局國家格網參考系統（），知名于其别称英國國家格網參考系統（），是一個地理格網系統，使用於大不列顛地區（北愛爾蘭適用的是可與本系統互補的另一套系統），與經緯度劃分有所區隔。
英國地形測量局（OS）是英國格網參考系統的設計者，並將這些系統廣泛應用在量測資料以及地圖的繪製上。其他的導覽書籍或政府出版物也會參考此系統。
參考文獻
- Standing, Peter (2006) [http://www.geograph.org.uk/article/In-Search-of-OV0000 OV0000 a unique grid square at Beast Cliff] , Geograph Project, UK, web article [accessed 11 June 2007]
外部連結
- [https://web.archive.org/web/20070926213723/http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidetonationalgrid/page1.html Ordnance Survey Guide to the National Grid]
- [https://web.archive.org/web/20070929111615/http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidecontents/guide1.html Ordnance Survey Guide to coordinate systems]
- [http://mdfs.net/Apps/Mapping/GridRef/ Programs to convert Ordnance Survey grid references]
- [http://www.nearby.org.uk/tests/GeoTools.html Open Source Javascript Conversion Library]
- [https://web.archive.org/web/20080118121420/http://www.jstott.me.uk/jcoord/ GPL Java Conversion Library]
- [http://www.streetmap.co.uk/streetmap.dll?G2M?X=500060&Y=500020&A=Y&Z=3 The sole part of Great Britain that lies in the OV square]
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