Dan D (meaning D-Day in Slovene) is a Slovenian rock band,[1][2] formed in 1996 in Novo Mesto.

The group was formed from the remnants of the Mercedes Band musical ensemble by the singer Tomislav Jovanovič (nicknamed Tokac) and the drummer Dušan Obradinovič (nicknamed Obra) who later invited his friend Marko Turk (Tučo) as the rhythm guitar, Primož Špelko as the bass guitar, and Aleš Bartelj as the solo guitar.

After Primož Špelko and Aleš Bartelj left, the band invited the bass guitarist Andrej Zupančič and the keyboardist Boštjan Grubar, and Tokac started to also play guitar.

In March 2007, Dan D and the Siddharta band performed at the presentation of the Slovenian media award Viktor in the Cankar Hall in Ljubljana the joint version of the Dan D's Voda and the Siddharta's song Male roke.

The concert was broadcast by TV Slovenija as well as by Val 202, the Slovenian national radio station.