There are several meanings of Haar:
- Haar (fog), a Scottish word for the fog or sea mist
- Hair in the German and Dutch languages
- Place names
- Haar, Bavaria, a municipality near Munich, Germany
- Haar (Westphalia), a hill range in North Rhine-Westphalia, Germany
- Family name
- Alfréd Haar (1885 – 1933), a Hungarian mathematician
- Haar wavelet, the first wavelet
- Haar measure, a set-theoretic measure
- Haar-like features, a technique in computer vision