The deal is reported to be worth between €10m (£9m) and €15m (£13.6m) and comes hot on the heels of Nokia's takeover of Plum, the Boston-based micro social networking site, which specialises in serving groups such as families and neighbourhood communities.
Dopplr founder and CEO Marko Ahtisaari was previously the Director of Design Strategy at Nokia. A spokeswoman for Nokia declined to confirm the reports, describing the story as a "market rumour".
Nokia has been expanding its presence in the mobile social network market for some time, having also acquired Cellity and Bit-Side this year.
Launched in 2007, Dopplr also reminds members of friends and colleagues who live in the cities they're planning to visit.
The company claims that Dopplr's users have already shared 70m miles of trips to over 2000 cities around the world.
The name "Dopplr" was inspired by Christian Doppler, a 19th Century scientist who came up with what's now known as the Doppler effect.