The news comes as the company reports a return to profit in its latest quarterly results.
The 100Mb service launches first in London, the south east and Yorkshire, with a full roll out expected in the new year.
Virgin Media is hoping the 100Mb service will be as popular as its 20Mb and 50Mb services.
Both services have seen a 41% increase in customers year-on-year to 700,000.
The move comes as Virgin Media reported a return to profit.
The company reported a net profit of £41.8m in the third quarter, up from a net loss of £60.1m in the same period last year.
Revenue increased to £978.4m, a 1.4% rise from £964.2m in the previous quarter, and a 6.4% increase from £919.4m in the same period last year.
The company says the increase in its average monthly churn from 1.5% to 1.6% was due to “intense marketing activity by some of our competitors.”
Satellite rival Sky reported revenue of £1.5bn in its latest results, up 15% quarter on quarter. Sky’s net profit was up 25% to £255m from £204m in the previous quarter.