Charities worldwide are invited to compete in a new competition to find the best online fund-raising video.

The Gold Star Award for Nonprofit Video Advertising will be presented by the Resource Alliance, organizers of an international conference on fund raising held in the Netherlands each year, and RAPP, a brand-marketing consulting firm. Both organizations are based in London.

Videos must be submitted by September 25. Entries must be under three minutes long, be uploaded onto YouTube, and have premiered in the previous 18 months. More rules and an online entry form are available on the contest Web site.

The winning video will be selected by a live audience vote at the International Fundraising Conference in October. In years past, the gathering has drawn more than 900 participants from some 50 countries.

Finalists will receive a discount on this year’s conference fee, while the winner will receive “a gold trophy” and free admission to next year’s conference.