The company had sold 5,75,056 units in the same month last year, Hero MotoCorp said in a statement.
Its previous highest sales in any month was in October 2013 when it sold 6,25,420 units.
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"With over 1,08,000 units of scooters sold in October, Hero MotoCorp crossed the landmark one-lakh unit sales in scooters in a month," the company said.
In the domestic market, Hero MotoCorp scooter sales grew by 74.6% in October this year over the corresponding month in 2014, it added.
"With this, the market share of Hero MotoCorp in the domestic scooter market has risen from 13% in September to almost 20% at the end of October," the company said.
Hero MotoCorp shares were trading at Rs 2,591.60 apiece on the BSE, up 1.67% from previous close.