The MSN Gallery award programme, which is being sponsored by Campaign, is open to any creative agency, company or brand.
A panel of judges will select the most inspiring campaigns that demonstrate new thinking, while creatively making the best use of technology.
The scheme also aims to raise awareness of online advertising by showcasing the winning entries at the MSN Gallery Exhibition, which will run for one week.
It is divided into five entry categories: public sector/NGOs and charity; finance; automotive; FMCG and leisure and entertainment. Entrants should complete the online form at www.gallery. msn.co.uk. The deadline for entries is midnight on 26 July.
Participants are also asked to write 100 words describing the thinking behind the campaign, the creative execution and any results that demonstrate the ad's creative success.
The winner in each category will receive £1,000, with one overall winner picking up a cheque for £5,000.
The entries chosen for the final shortlist will be announced at the end of August, with the winners to be honoured at the MSN Gallery launch party on 6 September.
MSN is the exclusive sponsor of the Cyber Lions awards at this year's International Advertising Festival in Cannes for the third consecutive year.