Elstob takes up her new position this week, working across Globus's Cosmos Tours, Globus Journeys and Avalon Waterways brands.
She will work alongside Head of Trade Marketing Nicola Cook on co-operative marketing campaigns, trade communications, agent engagement initiatives and marketing resources.
She brings more than 10 years' travel and aviation experience, including roles in marketing, sales and commercial account management.
Most recently, Elstob worked for The Travel Corporation as Partner Marketing Manager for TTC Tour Brands in the UK and Europe, covering the role on a maternity basis during Alice Boden's leave.
Her previous roles include Marketing Manager for southern Africa at Delta Air Lines, as well as positions with Beachcomber Tours, Air France and Air Mauritius.
Elstob will also work closely with the trade sales team as the three brands look to increase their engagement with agents and operators.
"Our partnerships with travel agents and tour operators are hugely important to us and the growth in the marketing team is a good representation as to how we want to be able to continue to support them and provide them with whatever they need," said Lesley Taylor, UK and Ireland Managing Director at Globus.
"Nikki will be a terrific new addition to our UK team and will play an integral role across marketing and the trade."