Ram Singh, chairman of the sect's political affairs wing, told PTI that the Dera has decided to support BJP candidates in Delhi elections.
Asked if the support was also for Akali dal candidates, he replied in the affirmative.
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The Dera, which has a considerable following in the Delhi's neighbouring states Harayana and Punjab, claims to have about 20 lakh followers in Delhi alone out of which 12 lakh are voters.
The sect had announced to support BJP candidates during Haryana Assembly polls last year and the party stormed to power for the first time on its own.
"Today's announcement was made by the political wing of Dera, which has 15 members," political wing (Delhi unit) vice president Amandeep Insan told PTI.
He claimed that the Dera has about 20 lakh followers in Delhi and they have been told to vote for BJP candidates in tomorrow's polls.
"Gurmeet Ram Rahim Singh is impressed by Prime Minister Narendra Modi's initiatives like Swachh Bharat Abhiyan, drive against female foeticide and drugs in the country," Amandeep told PTI.