| 1879 | Priestly ordination of Deacon Thomas Jackson mhm |
| 1887 | Baptism of four boys in Inobong by Fr Prenger |
| 1888 | Baptism of first two catechumens in Papar: Simon & Barnardus |
| 1950 | Singaporean Legionaries Margaret Chee & Mary Tsen give talks on Legion of Mary in Jesselton, Penampang & Papar |
| 1974 | SH Prayer Group started by Daniel Kong & Agnes Tai |
| 1980 | Formation of SH Youth Ministry |
| 1995 | Population update of KK Diocese by Fr Peter Kim sj |
| 1997 | Formation of SH Ministry of Apologetics |
| 2001 | Death of Fr Lambert van der Geest mhm |
April 1
| 1916 | Death of Msgr Thomas Jackson |
| 1971 | Formation of Sabah Catholic Nurses Guild |
| 1992 | Death of Sr Mary Martha Boijion fsic of lung cancer |
| 2011 | Death of Fr Michael Henselmans mhm |
April 2
| 1986 | Silver jubilee of Sr Anna Maria of the Holy Spirit (Angeline Edmund) ocd of Kg Gunsing Penampang |
April 3
| 2016 | Jubilee of Divine Mercy SHC |
April 4
| 1883 | Arrival of Fr Alexander Prenger |
| 2003 | Blessing of CDC grotto by Fr Michael Modoit |
| 2004 | DSCC roadshow in Tanjung Aru |
April 5
| 1979 | Death of Fr Francis Xavier Sint in Austria |
April 6
| 1979 | Death of Fr Francis Xavier Sint mhm |
| 2017 | Chrism Mass SHC 7:30 pm |
April 7
| 1947 | Priestly ordination of Deacon John Tsung in Jinan Shantung China for Diocese of Chow Tsan China |
| 1972 | Silver jubilee of Fr Tsung |
| 1983 | Bible seminar by Fr Herman Hendrickx cicm KK Seminary Apr 7-15 |
| 1986 | Inaugural vocation retreat w/ 17 participants BTRC April 7-10 |
| 1988 | Chinese catechetical seminar by Martina Voo & Stella Yong CDC |
| 1995 | Forum on forming youth with vision from Christian & Islamic perspectives, ITM Sabah Campus Manggatal |
April 8
| 1983 | Death of Sr Consolata Thien fsic, 68 |
| 1992 | 7th World Youth Day for West Coast SHC April 8-12 |
April 9
| 1854 | Priestly ordination of Don Carlos Cuarteron |
| 1903 | Procurement of Jesselton mission land by Fr Goossens & Prenger in Fr Heyden’s name |
| 1985 | Inaugural FSIC General Assembly April 9-19 |
| 1999 | PRW in KK/Dontozidon/Kepayan/Tawau April 9-11 |
| 2002 | Asian bishops’ convivience organised by neo-catechumenal community, Nexus Resort Karambunai April 9-11 |
April 10
| 1977 | Inaugural BM Mass in Tawau |
| 1981 | 2nd Youth Leadership Training Seminar by Peter Thien & John Tham KK Seminary April 10-12 |
| 1988 | Christian Home Workshop (BM) in Ulu Dusun Sandakan |
| 1996 | Recollection for Keningau Leaders Service Team PKK Purun April 10-12 |
| 1998 | Inaugural novena to Divine Mercy in St Michael Penampang |
| 1999 | Inaugural Keningau Chinese prayer group meeting KSFX |
| 2016 | Tercentenary celebration of the Founder’s death and origins of the Brothers of St Gabriel, MYTC |
April 11
| 1971 | Oldest existing edition of Catholic Sabah in tabloid format found in the KK Diocesan Archives |
| Inaugural PAX Assembly SHPH/St Michael Parish Hall April 11-12 |
April 12
| 1980 | SH youth retreat KK Seminary April 12-13 |
| 1996 | Silver jubilee of PAX establishment |
April 13
| 1898 | Death of Fr Felix Westerwoudt mhm |
| 1987 | Remains of Bishop Fung reburied at SHC compound |
April 15
| 1985 | Tan Sri Ben Stephens elected as president of Malaysian Senate KL |
| 1990 | Launching of Murut Gospel according to Mark, St Anthony Tenom |
| 1992 | Demolition of 39-year-old La Salle School semi-timber Junior Block |
| 1995 | 2nd KK Diocesan Kaamatan Festival Limbanak |
April 16
| 1857 | Msgr Don Carlos Cuarteron lands in Labuan & starts mission there |
| 1982 | Youth Leadership Training Seminar KK Seminary April 16-18 |
| 1986 | Death of Mother Rose Charnley fmsj in England |
| 1987 | Golden jubilee of Sr Elizabeth of the Trinity (Evelyn Maud Perkins) ocd |
| 1989 | Death of Constantine Cheah Teck Seng of Labuan |
| 1999 | PRW in KK/Lahad Datu |
April 17
| 1955 | Priestly ordination of China-born Deacon Peter Ma at SH Jesselton by Bishop Buis, the first ordination ever held in North Borneo |
| 1980 | Silver jubilee of Fr Peter Ma, Stella Maris Tg Aru |
| 1996 | Death of Fr Jan vd Salm mhm, 65, at Conda Holland, of cancer |
| 2004 | 2nd Educators conference, Berjaya Palace Hotel KK April 17-18 |
April 18
| 1980 | Inaugural Catholic Youth Leadership Training Seminar April 18-20 |
| 1982 | Blessing of Tenghilan Church by Bishop Fung |
| 1995 | 5th National Christian Conference: the Way Forward, Sabah Medical Centre Likas April 18-21 |
| 2004 | Blessing of St Joseph Pogunon by Bishop Lee |
| DSCC roadshow in Manggatal |
April 19
| 1976 | Silver jubilee of Legion of Mary in Sabah |
| 1996 | KSFX Youth Assembly April 19-21 |
April 20
| 2001 | Formation of KK Diocesan Social Communication Commission w/ Sr Bibianah Densia fsp as head, CDC |
| 2002 | SH “Cleanathon Day” at Tanjung Aru Beach in conjunction with World Earth Day (Apr 22) |
| Dissolution of Chinese Youth Committee to make way for Chinese Youth Pastoral Team CDC | |
| 2013 | Death of Fr Louis Purcell mhm |
April 21
| 1987 | Msgr Lee’s appointment as 2nd bishop of KK published in L’Osservatore Romano |
| 1994 | Seminar on diocesan administrative structures by Fr Peter Kim sj CDC |
| 1996 | KK diocese catechists renewal seminar BTRC April 21-24 |
| 1998 | Food donations brought to drought victims (62 families) in Kg Tongkudon & Kg Sungoi Kota Marudu by SH Charity Outreach Services |
April 22
| 1979 | Blessing of Holy Nativity Terawi by Bishop Fung |
| 1994 | Sandakan mini-PAX |
| 2000 | Death of Fr Patrick McDonald mhm, 68, in Scotland |
April 23
| 1889 | Death of Fr Daniel Kilty mhm |
| 1988 | Interior Zone Pesta Koir Keningau |
| 1995 | Keningau diocesan curia meeting Tambunan |
| Pastoral visit of Bp Lee & PAX officials to Tuaran | |
| 1999 | PRW in Kudat |
| 2003 | Formation of Malaysia Catholic Students Council (MCSC) in Kuching |
| 2017 | Regional Family Life Commission meeting in Johor |
April 24
| 1976 | Silver jubilee of Sr Bernadette Amandus fsic, Penampang |
| 1980 | Priestly ordinations of Deacons Joseph Liansim, Bede Anthonius, Joseph Gapitang at Tambunan Community Hall |
| Death of Bp James Buis mhm, 77, Arnhem Holland | |
| 1983 | 1st profession of RGS Novice Lucy Mahanggun of Inobong in Singapore |
April 25
| 1972 | 2nd PAX Assembly SHPH/Penampang April 25-26 |
| 1990 | Catechetical renewal course for Sunday School teachers (Eng) Benildus House Tg Aru (BM at CDC) April 25-29 |
| 1995 | “Steward leadership for a participative Church” organized by Bible Commission in Tawau April 25-30 |
| 1999 | Launching for first FSIC musical album by Bishop Lee SHC |
April 26
| 1984 | Formation of Limbahau prayer group |
April 27
| 1981 | First profession of La Salle Br Herbertus Gampok in Penampang |
| 1993 | Fr Gerard Preyde mhm receives “knighthood of the Order of Oranje-Nassau” from Dutch Ambassador BTRC |
| 1996 | Opening of new Maktab Nasional building by Bishop Lee |
| Keningau Women Seminar Tambunan April 27-29 | |
| 2003 | Inaugural weekend experience for interested prospects organised by diocesan aspirants CDC April 27-28 |
April 28
| 1978 | Formation of Catholic Teachers Guild in Sandakan April 28-30 |
| 1989 | LJCCC Married Women Retreat facilitated by Bishop Lee April 28-30 |
| 1994 | Br Ben Snoeren receives knighthood fron Dutch Ambassador in Miri |
| 1995 | KK Diocesan Youth Consultation in Limbahau |
| 1996 | 115th foundation anniversary of St Patrick Kinuta |
| 2012 | Priestly ordination of Deacon Roney Mailap in Tenom by Bp Piong |
April 29
| 1978 | Inauguration of EX-Franciscan Association (EFA) |
| 1988 | 3rd Colloquium of the Teachers Development Programme BTRC April 29-May 2 |
| 1996 | Death of Thomas Lee Yen Chiang, father of Bp Lee |
April 30
| 1973 | Blessing of new Blessed Sacrament Church Labuan by Bp Buis |
| 1987 | Seminar on Book of Revelation by Fr John Ha SHPH April 30-May 3 |
| 1988 | Inaugural diocesan youth festival CDC April 30-May 1 |
| 1994 | Leadership Formation Programme CDC April 30-May 2 |
| 1995 | Telematch organized by Labuan parish youth |
| 1998 | Inaugural Keningau Diocesan Solidarity Cup Football Tournament, Tenom Sports Complex |