Theta (priflythyren Θ; llythyren fach θ) yw'r wythfed lythyren yn yr wyddor Roeg. Yn y system rhifolion Groegaidd, mae ganddi werth o 9.
 | |
| Yr wyddor Roeg | |
|---|---|
| Α α Alffa | Ν ν Nu |
| Β β Beta | Ξ ξ Xi |
| Γ γ Gamma | Ο ο Omicron |
| Δ δ Delta | Π π Pi |
| Ε ε Epsilon | Ρ ρ Rho |
| Ζ ζ Zeta | Σ σ ς Sigma |
| Η η Eta | Τ τ Tau |
| Θ θ Theta | Υ υ Upsilon |
| Ι ι Iota | Φ φ Ffi |
| Κ κ Kappa | Χ χ Chi |
| Λ λ Lambda | Ψ ψ Psi |
| Μ μ Mu | Ω ω Omega |
| Llythrennau Hynafol | |
| Ϝ ϝ Fau | Ϻ ϻ San |
| Ϛ ϛ Stigma | Ϟ ϟ Qoppa |
| Ͱ ͱ Heta | Ϡ ϡ Sampi |
| Ϸ ϸ Sho | |
Defnyddir fel symbol mathemategol am ongl.
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