MIRI image of Westerlund 1 taken with the JWST/MIRI FIOOOW filter. The black polygons delineate the nebulosity regions discussed in the text. Purple circles indicate the positions of the massive stars listed by Clark et al. (2020), with WR star positions highlighted in blue and the evolved stars in red. The position of the magnetar CXO J164710.2-455216 (Muno et al. 2006, Borghese et al., in prep.) is also indicated.