Hellmuth may refer to:
- Hellmuth Heye (1895–1970), German admiral and politician
- Hellmuth Hirth (1886–1938), German engineer who founded engine manufacturing companies
- Hellmuth, Obata and Kassabaum, an architecture-engineering firm
- People
- Hellmuth Karasek (born 1934), German journalist, literary critic, novelist and author
- Hellmuth Mäder (1908–1984), German general
- Hellmuth Reymann (1892–1988), German Army officer
- Hellmuth Walter (1900–1980), German engineer who pioneered research into rocket engines and gas turbines
- Hellmuth Walter Kommanditgesellschaft, a company
- Hellmuth Wolff (organ builder) (born 1973), Canadian organ builder
- Isaac Hellmuth (1819–1901), founder of Huron University College and the University of Western Ontario
- Otto Hellmuth (1896–1968), member of the Nazi party
- Phil Hellmuth (born 1964), American poker player