A bandpass filter with adjustable bandwidth based on a press-induced long-period grating in a twisted holey fiber is presented. By twisting the holey fiber prior to the application of periodic pressure, each rejection band of the nontwisted induced long-period grating is split into two shifted rejection bands that move further apart as the twist ratio increases. This feature results in a wide bandpass filter with controllable bandwidth. A bandpass filter at $1523\mathrm{nm}$ with adjustable bandwidth from $15\text{\hspace{0.17em} to \hspace{0.17em}}65\mathrm{nm}$ with near-linear response and insertion loss lower than $0.7\mathrm{dB}$ is demonstrated. Additionally, the bandpass filter can be tuned over $100\mathrm{nm}$ .