An operator $$S_{\varphi ,\psi }^{u}\in \mathcal {L}(L^2)$$ S φ , ψ u ∈ L ( L 2 ) is called the dilation of a truncated Toeplitz operator if for two symbols $$\varphi ,\psi \in L^{\infty }$$ φ , ψ ∈ L ∞ and an inner function u, $$\begin{aligned} S_{\varphi ,\psi }^{u}f=\varphi P_uf+\psi Q_uf \end{aligned}$$ S φ , ψ u f = φ P u f + ψ Q u f holds for $$f\in {L}^{2}$$ f ∈ L 2 where $$P_{u}$$ P u denotes the orthogonal projection of $$L^2$$ L 2 onto the model space $$\mathcal { K}_{u}^2=H^2{\ominus }{{u}H^2}$$ K u 2 = H 2 ⊖ u H 2 and $$Q_u=I-P_u.$$ Q u = I - P u . In this paper, we study properties of the dilation of truncated Toeplitz operators on $$L^{2}$$ L 2 . In particular, we provide conditions for the dilation of truncated Toeplitz operators to be normal. As some applications, we give several examples of such operators.