Here are the Russian Orthodox Saints that begin with the letter "G," with their feastdays where applicable.
- Gabriel, Archangel, July 13
- Gabriel the New Martyr, February 2
- Gabriel, Archbishop of Serbia, November 13
- Gaza, Seven Virgin Martyrs of, August 31
- Gelasius the Monk, December 31
- Genevieve of Paris, January 3
- Gennadius of Kostroma, January 23
- Gennadius of Vazhe Lake, January 8 and February 9
- George of Ioannina, January 17
- George of Chios, November 26
- George the Chozevite, January 8
- George of Cyprus, April 23
- George the Georgian, (also known as Zorses), January 2
- George the Great Martyr, October 2
- George Novitsky of Petrograd, July 31
- George of Shenkursk, April 23
- George the Sinaite, March 11
- George the Tailor, February 14
- George, Recluse of Zadonsk
- George Lazar
- Gerasmus of the Jordan, March 4
- Germanus of Caesarea, November 13
- Geronty the Canonarch of the Far Caves, April 1
- Gleb the Passionbearer
- Glykeria, May 13
- Golinduc of Persia, July 13
- Gordias, January 3
- Gregory, January 8
- Gregory V, April 10
- Gregory the Dialogist
- Gregory of Khandzta, October 6
- Gregory of Nyssa, January 10
- Gregory Palamas, March 25
- Gregory the Sinaite, April 6 and August 8
- Gregory the Theologian, January 1 and January 25
- Gregory the Wonderworker, November 17
- Gregory the Wonderworker of the Far Caves, January 8
- Gregory the Wonderworker of the Kiev Caves, January 8
- Grimbald, July 8
- Gury of Kazan, December 5
Source: http://www.gnisios.narod.ru/lives.html