No. The tuba plays a full octave below the baritone (maybe two octaves, I can't remember). Also, baritone players typically read treble cleff music, but tuba players read bass cleff, and baritone is not a concert pitch instrument. On the other hand, the euphonium is a concert instrument and plays bass cleff music. However, that said, some baritone players can read bass cleff music.
Baritone horn, Sousaphone, Euphonium, Contrabass bugle, and Alto Horn
The euphonium is also known as the tenor tuba, baryton(Ger.), basse à pistons(Fr.), and sometimes mistakenly referred to as a baritone horn or just a baritone. The baritone horn, however, is a cylindrical bore instrument with a brighter tone (closer to trombone timbre) than a euphonium. The bore of the baritone is often much smaller than that of the euphonium. The euphonium is a conical bore (gets larger is we reach the end) instrument with a warmer and darker tone than a baritone.
French Horn Tuba Trumpet Baritone Euphonium Trombone Cornet
Trumpet, French horn, trombone, tuba, in an orchestra; euphonium and baritone horn in a concert band; tenor horn and alto horn in a British-style brass band.
If the pipes of a baritone were straightened out it would be 9 foot (2.74mtrs) end to end, which is the same as a trombone and a euphonium.
Baritone horn, Sousaphone, Euphonium, Contrabass bugle, and Alto Horn
The baritone horn is similar to the euphonium, which was developed in the 1840s, so the baritone came a short time later.
French horn, trumpet, tuba, bar-sax (also part woodwind), baritone, euphonium (like baritone, but with straight top).
The euphonium is also known as the tenor tuba, baryton(Ger.), basse à pistons(Fr.), and sometimes mistakenly referred to as a baritone horn or just a baritone. The baritone horn, however, is a cylindrical bore instrument with a brighter tone (closer to trombone timbre) than a euphonium. The bore of the baritone is often much smaller than that of the euphonium. The euphonium is a conical bore (gets larger is we reach the end) instrument with a warmer and darker tone than a baritone.
Trumpet, French horn, Trombone, Baritone/Euphonium and Tuba.
Euphonium and baritone horn
French Horn Tuba Trumpet Baritone Euphonium Trombone Cornet
Cornet, flugel horn, tenor horn, baritone, euphonium, trombone, tuba.
Euphonium comes to mind. That's a baritone horn.
Euphonium and baritone horn A+
Trumpet, French horn, trombone, tuba, in an orchestra; euphonium and baritone horn in a concert band; tenor horn and alto horn in a British-style brass band.
French Horn, Trumpet, Cornet, Trombone, Tuba, Sousaphone, Baritone and Euphonium.