Sidr or SIDR may refer to:
Cyclone Sidr, a very severe cyclonic storm in the Bay of Bengal in 2007 As Sidr, Saudi Arabia, a village Sidra, Libya, a port city Ziziphus lotus, a small tree Ziziphus zizyphus (jujube), a small tree Secure Inter-Domain Routing, in computer networking
See also Sidre, an early word for cider The Sidrat al-Muntaha, a sidr tree mentioned in the Quran