Registrations on the Alternative Wedding List, the UK's first online charitable wedding gift list, are four times higher than at the same time last year.
Give It, the company that owns the list, is attributing the rise to an escalation in public altruism generated by the Boxing Day tsunami and the growing focus on poverty in Africa.
Instead of requesting kettles and toasters, betrothed couples can choose from a number of ready-made lists including donations to charities such as Barnardo's, FARM-Africa, Help the Aged and the Terrence Higgins Trust.
The couple's guests can then select a gift to a charity of their choice, which might be anything from restoring someone's sight to buying a goat for a family.
Andy Hickey, head of the service, said: "By this time last year we had 100 registrations - this year we have received 400. The events of Boxing Day and the increased focus on Africa have encouraged marrying couples to think differently about the sort of gift list they would like their guests to select from."