Here are the Russian Orthodox Saints that start with the letter "D." Their feastdays are with them there, too, if possible.
- Dalmatus of Siberia, February 15
- Damaskinos, January 16
- Damaskinos of Constantinople, November 13
- Damian and Cosmas
- Damian the Healer of the Kiev Caves, October 5
- Damian the New Martyr, February 14 and 23
- Daniel the Former Ishmaelite, November 18
- Daniel, Martyr in Cilicia, February 16
- Daniel the Prophet
- Daria, March 19
- David of Garesja, Thursday after Ascension
- David of Wales, March 1
- Demetrius of Galata, January 27
- Demetrios the Great Martyr, October 26
- Demetrios of the Peleponnesus, May 28
- Demetrios of Philadelphia, June 2
- Demetrios Tornaras, March 19
- Demos the New Martyr, April 10
- Denis the Areopagite, October 3
- Denis, March 11
- Denis of Glushitsa, June 1
- Denis the New Maryr, November 1
- Denis Shchepa of the Far Caves, October 3
- Deusdedit, July 14
- Dimitry of Salonica, Great Martyr
- Dimitry, Bishop of Rostov
- Diodorus, March 19
- Diodorus of Yuriegorsk, November 27
- Dius, July 19
- Dometian, Bishop of Melitineia, January 10
- Domnica of Constantinople, January 8
- Domninus of Palestine, November 5
- Dorotheus, Bishop of Gaza, June 5
- Dorotheus of Gaza, August 13
- Dorotheus of Palestine, November 5
- Dorotheus of Thawatha, August 13 and February 19
- Dorothy of Kashin, September 24 and February 6
- Doukas the Tailor, April 24
- Dunstan, May 19
Source: http://www.gnisios.narod.ru/lives.html