Sai Mai subdistrict
{{Infobox settlement
|official_name = Sai Mai
|native_name = สายไหม
|settlement_type = Khwaeng
| coordinates =
|motto =
| image_map = {{#property:P242}}
| map_caption = Location in Sai Mai District
|subdivision_type = Country
|subdivision_name ={{flag|Thailand}}
|subdivision_type2 = Province
|subdivision_name2 = Bangkok
|subdivision_type3 = Khet
|subdivision_name3 = Sai Mai
|established_title =
|established_date =
|area_total_km2 = 18.659
|area_water_km2 =
|population_as_of = 2020
|population_footnotes =
|population_note =
|population_total = 80784
|population_density_km2 =
|timezone = ICT
|utc_offset = +7
|elevation_footnotes =
|elevation_m =
|postal_code_type = Postal code
|postal_code = {{#property:P281}}
|area_code =
|blank_name = TIS 1099
|blank_info = {{#property:P1067}}
|website =
|footnotes =
|image_skyline= ถนนสุขาภิบาล 5.jpg
|caption = Sukhaphiban 5 Road near Wat Nong Yai
}}
Sai Mai ({{langx|th|สายไหม}}, {{IPA|th|sǎːj mǎj|pron}}) is a khwaeng (subdistrict) of Sai Mai District, in Bangkok, Thailand. In 2020, it had a total population of 80,784 people.{{cite web|url=https://stat.bora.dopa.go.th/stat/statnew/statyear/#/TableTemplate4/Area/statpop?yymm=63&ccDesc=%E0%B8%81%E0%B8%A3%E0%B8%B8%E0%B8%87%E0%B9%80%E0%B8%97%E0%B8%9E%E0%B8%A1%E0%B8%AB%E0%B8%B2%E0%B8%99%E0%B8%84%E0%B8%A3&topic=statpop&ccNo=10&rcodeNo=1042&rcodeDesc=%E0%B9%80%E0%B8%82%E0%B8%95%E0%B8%AA%E0%B8%B2%E0%B8%A2%E0%B9%84%E0%B8%AB%E0%B8%A1|publisher=Department of Provincial Administration|title=Population statistics 2020|language=Thai|accessdate=27 November 2021}}