The Greek alphabet has twenty-four letters.
Presented in the form of :
Greek Letters (Capital followed by lowercase) - Name - English Name -  Pronunciation
Print and practice: Lowercase and Uppercase Writing Practice - Lowercase With Arrows 

Α α - άλφα - Al-fa - a as in father
Β β - βήτα - Vee-ta - v as in voice
Γ γ - γάμμα - Gam-ma - y sound as in yes before ε or any letter or combination with an ee sound; otherwise pronounce as the g in go.
Δ δ - δέλτα - Thel-ta - th as in this
Ε ε - έψιλον - Ep-see-lon - e as in met
Ζ ζ - ζήτα - Zee-ta - z as in zoo
Η η - ήτα - Ee-ta - ee as in see
Θ θ - θήτα - Thee-ta - th as in think
Ι ι - ιώτα - Ee-o-ta - ee as in see
Κ κ - κάππα - Kap-pa - k as in king or c in cat
Λ λ - λάμβδα - Lam-tha - l as in love
Μ μ - μι - Mee - m as in man
Ν ν - νι - Nee - n as in name
Ξ ξ - ξι - Ksee - x as in box or socks
Ο ο - όμικρον - O-mee-kron - o as in no
Π π - πι - Pee - p as in pen
Ρ ρ - ρο - Ro - lightly rolled r
Σ σ/ς - σίγμα - Seeg-ma - s as in sun
Τ τ - ταυ - Taf - t as in top
Υ υ - ύψιλον - Ee-psee-lon - ee as in see
Φ φ - φι - Fee - f as in father
Χ χ - χι - Hee - Breathy h as in he
Ψ ψ - ψι - Psee - ps as in lips
Ω ω - ωμέγα - O-me-ga - o as in no