Christian Julius Weissenborn (April 13, 1837 – April 21, 1888) was a bassoonist, teacher and composer.
Weissenborn was born in Friedrichs-Tanneck near Eisenberg, Thuringia. He was principal bassoonist of the Leipzig Gewandhaus Orchestra from 1857 – 1887. He taught at the Leipzig Conservatory beginning in 1882. Apart from a small canon of Romantic works, he is chiefly remembered for his pedagogical works, the Practical Bassoon School and the Bassoon Studies, Opus 8 (which includes the "Fifty Advanced Studies"), which are still in widespread use. He died, aged 51, in Leipzig.
The Practical Bassoon School (called "Practical Method for the Bassoon" in the American editions) consists primarily of 25 sets of exercises that gradually increase in difficulty, from the most elementary level to intermediate. Following this there is a brief introduction to the tenor clef and a fairly detailed discussion of various ornaments, with a 26th section applying these concepts.
The Bassoon Studies, Opus 8 is published in two parts. The first part is subtitled "For Beginners" and consists of several sections:
- I. Essential Kinds of Expression (Tenuto, Legato, Staccato, Portato, Dynamics, Accents);
- II. The Tenor Clef (brief);
- III. Scale Exercises in All Keys;
- IV. Arpeggios and chords;
- V. Chromatic scales;
- VI. Thirds, Fourths, Sixths, Octaves and Tenths;
- VII. Embellishments
The second part is the famous Fifty Advanced Studies that nearly all bassoonists are required to learn during their formative years. While some of these are at an intermediate level, most of them are quite challenging, exploring all keys and even the extreme ranges of the bassoon. 
Six Trios for 3 Bassoons, Op. 4
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- Famous Bassoon Tutors and Their (Less Known) Authors. Jansen, Will. The Journal of The International Double Reed Society Number 2, 1974.
- New Grove Dictionary of Music and Musicians, s.v. "Weissenborn, (Christian) Julius". 1980.
- Free scores by Julius Weissenborn at the International Music Score Library Project (IMSLP)