The NCVO will pay for seven places for smaller charities at each of the three major party political conferences this autumn.
The umbrella body is asking members to apply for the chance to have passes and accommodation paid for at the Labour, Conservative and Liberal Democrat conferences, which take place in September and October.
Two of the seven places at each of the conferences will be allocated to local NCVO members in Bournemouth, Brighton and Manchester.
Each selected organisations will get a two-day pass to one of the party conferences, one night's accommodation and paid travel. The organisation declined to reveal how much the initiative would cost.
Ann Blackmore, head of policy at the NCVO, said: "It's important that all charities, large or small, are given the chance to meet politicians to get their messages across.
"The bursary scheme will give smaller charities the chance to have their say at one of the biggest political events of the year."
The NCVO will also organise a programme of meetings at the conferences for the winners, including a round-table discussion with senior MPs or ministers.
To qualify for the scheme, which has been expanded since last year, an organisation should have a turnover of less than £500,000, be a registered charity and an NCVO member.
The closing date for applications is 5 June.
Organisations wanting more information and an application form should visit the NCVO website.