Sarlahi 3 is one of four parliamentary constituencies of Sarlahi District in Nepal.

This constituency came into existence on the Constituency Delimitation Commission (CDC) report submitted on 31 August 2017.

[1]Sarlahi 3 incorporates Hairwan Municipality, Bagmati Municipality, Chakraghatta Rural Municipality, ward 1 of Haripur Municipality, wards 5–12 and 16–18 of Barahathawa Municipality, wards 3–6 of Kabilasi Municipality and wards 4–6 of Basbariya Rural Municipality.

It encompasses the following Province No.

2 Provincial Assembly segment