Bea, is a fictional character in the UK comic strip Dennis the Menace and Gnasher, from The Beano. She is Dennis' baby sister, born in issue 2931, dated 19 September 1998. She was part of a major storyline which had been going on in the strip for the last few weeks, as part of the comic's 60th birthday. Strange things had been happening, like Dennis' mother feeling sick all the time, and Dennis' father in an unusually happy mood. After his parents refused to tell him what was going on, he refused to appear in the next week's Beano. After various Beano characters tried to take the place of Dennis, he came back and his parents told him of the new arrival. These were the first strips drawn by the new artist David Parkins , who had taken over from the previous artist, David Sutherland .

Her name, short for 'Beatrice' was chosen by Beano readers via the Beano website, which had just launched at the time. It was possibly inspired by the yellow and black stripes on her clothes, which resemble the colours of a bee. In issue 2935 (17 October 1998) her own strip started, called Beaginnings. In this issue she said her first word, 'Mud'. From issue 3099 onward (8 December 2001) the title has been Dennis's Little Sister Bea - the Mini-Menace (sometimes abbreviated to Bea - the Mini-Menace, or just Bea) a title it still has today. Throughout the strip has mostly been drawn by Nigel Parkinson , who also draws the main Dennis strip every now and again. Bea was voted naughtiest baby in Beanotown when she was only a week old, has Gnipper as her dog, and loves playing with Rasher. Issue 2942 (5 December 1998) was a special issue dedicated to her, where she appeared in every strip in the comic.