October 2009 is one of the biggest months for Hindus in 2009 in which the biggest festival for Hindus, Diwali, is celebrated along with the holy month Kartik.

Here is the list of important Hindu festivals and auspicious days celebrated in October 2009:

• Padmanabha Dwadashi 2009 – October 1
• Dwidala Vrata arambh (Dwidala vrat begins) – October 1
• Kojagari Purnima – October 3
• Kojagari Lakshmi Puja – October 3
• Sharad Purnima 2009 – October 3 – Ashwin Poornima
• Koumudi Pooja – October 3 – Kaumudi Utsav
• Valmiki Jayanthi – October 4
• Lalitha Devi Yatra – October 5
• Atla Thaddi 2009 – October 7
• Sankashta hara chaturthi – October 7
• Karwa Chauth – October 8
• Chitta Karthe – October 11
• Ekadashi – October 14
• Dhanteras 2009 – Dhantriodasi – October 15
• Dhanvantari Jayanti 2009 – October 16
• Pradosh Pooja – October 16
• Choti Diwali – October 16
• Diwali 2009 – Deepavali – October 17
• Kali Puja 2009 – October 17
• Narak Chaturdashi – October 17
• Tula Sankraman – Tula Sankranthi – October 17
• Pitru Tarpanam – October 17
• Dhana Lakshmi Pooja – October 18
• Govardhan Puja 2009 – October 18
• Kedareshwara Vrata – October 18
• Ashwayuja Amavasya – October 18
• Vikram New Year 2066 – October 18
• Akasha deepa arambh – October 18
• Bhai Dooj 2009 – Bhai Phota – Bhav Bij – October 19
• Yama Dwitiya – October 19
• Bali Puja – October 19
• Bhagini Hastha bhojanam – October 19
• Dhanvantari Dwitiya – October 20
• Trilochana Gauri Vrata – October 21
• Nagula Chavithi 2009 – October 22
• Chhat Nahai Khai – October 22
• Kharna Chhat Festival – October 23
• Nagula Panchami – October 23
• Swathi Karthe – October 23
• Chhat Puja 2009 – October 24
• Chhat Sandhya Argh – October 24
• Chhat Suryoday Argh – October 25
• Bhanu Saptami – October 25
• Goshtashtami – October 26
• Karthaveeryarjuna Jayanthi – October 26
• Krutha Yugadi – October 27
• Yagnavalkya Jayanthi – October 27
• Ekadashi – October 29
• Ksheerabdhi Dwadashi – October 3o
• Chilku Dwadashi – October 30
• Chukkala Dwadashi – October 30
• Yogeeshwara Dwadasi or Yogini Dwadasi – October 30
• Shani Trayodashi – October 31

It is to be noted that as per Telugu, Kannada, Marathi and Gujarati calendars, October 2009 begins on Ashwayuj Shukla Dwadashi and ends on Karthik Shukla Trayodashi. As per North Indian calendars, October 2009 starts on Ashwin Shukla Dwadasi and ends on Kartik Shukla Triodasi.