Lillerød (sometimes named Allerød) is a Danish town, seat of the Allerød Municipality, in the Region Hovedstaden. Its population 1 January 2024 was of 16,801.

Lillerød is located in the northern side of the Zealand island, 27 km north-northwest (NNW) from Copenhagen and 26 km southwest (SW) from Helsingør.

Lillerød is served by Allerød railway station, located on the North Line of Copenhagen's S-train network.

• Aage Haugland (1944 – 2000 in Lillerød) a Danish operatic bass
• Jussi Adler-Olsen (born 1950) a writer of crime fiction, a publisher, editor and entrepreneur; lives in Allerød
• Henrik Fisker (born 1963 in Allerød) a Danish-American automotive designer and entrepreneur, lives in Los Angeles
• Peter Reichhardt (born 1967) a Danish actor and theatre director, director of the Mungo Park from 1998 to 2005
• Kate Hall (born 1983) a Danish-British singer, brought up in Lillerød, living in Germany
• Kaka, stage name of Rajabu Willer (born 1991 in Allerød) a reggae, dancehall and hip hop artist of Tanzanian descent

• Martin Andersen (born 1986) a Danish footballer, 200 club caps
• Andreas Christensen (born 1996) a Danish footballer with Barcelona., played 68 games for Denmark.
• Rasmus Svane (born 1997 in Allerød) a German chess grandmaster

• Allerød station
• Mungo Park, a theatre in Lillerød
• Lillerød Church

Media related to Lillerød at Wikimedia Commons