This dataset provides palaeoecological and sedimentological data for the Late-glacial and Holocene sediment sequence retrieved from Lake Uddelermeer (The Netherlands) in 2012. Counts of pollen and chironomids are presented against both depth (cm) and age (cal yr. BP), and a loss-on ignition record is presented against depth. A total of 110 samples were analysed for their pollen content; a subset of 32 samples was analysed for sterol and stanol compounds. A total of 1412 samples were analysed for their organic content, approximated through loss-on-ignition. The data provides information on changes in the local and regional vegetation, changes in the within-lake ecosystem and changes in minerogenic input into the lake. The dataset has been used to identify Holocene lake level changes at the site. Cores were retrieved from the centre of the lake using a 3-m long handheld piston corer deployed from a floating coring platform during field work in April and May 2012. Samples were obtained from splits of the core and processed in the laboratory of the University of Amsterdam (the Netherlands) using standard protocols. Individual pollen grains and chironomid head capsules were identified using high-power microscopy, and loss-on-ignition was determined using combustion in a 550C oven. Name of the Campaign: UDD Event Label: UDD-E Method: Uwitec piston corer Latitude: 52.24652778 Longitude: 5.76097222 Elevation: 24m asl Date/Time of event: 2012-05-01T14:00:00 Further information about event: Lake sediment sequence retrieved using a 60 mm piston corer deployed from a floating platform. Pollen classification as used by Engels et al. (2016) is provided: TS = Trees and Shrubs Hea = Heathland taxa HI = Upland herbaceous taxa SP = Spore plants SA = Swamp and Aquatic plants Alg = Algae Fun = Fungi Oth = Other (/unclassified)