Jalan Langgar is a major road in Alor Setar, Kedah. It connect Alor Setar to Langgar, a suburb on the northeast of the city. On the western end, Jalan Langgar connects to Jalan Penjara Lama, at the intersection with Jalan Raja.
The short section between that intersection and Jalan Selamat, the road is a one-way street with traffic entering from Jalan Selamat. East of Jalan Selamat, Jalan Langgar is a two-way road. It continues all the way to Langgar and extends a little bit more, to end at the junction with State Route K129. Jalan Langgar is also known as Federal Route 256.